Description of problem:


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.Navigate to Administer->environment.
2.click on default pool family link and delete it.

  
"undefined method `provider' for nil:NilClass" is displayed. see attached screenshot


rails.log:
 InstanceParameter Load (0.4ms)  SELECT "instance_parameters".* FROM "instance_parameters" WHERE ("instance_parameters".instance_id = 1)
  SQL (0.2ms)  ROLLBACK
undefined method `provider' for nil:NilClass
/usr/share/aeolus-conductor/app/models/instance.rb:482:in `destroy_on_provider'
 /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/callbacks.rb:440:in `_run_destroy_callbacks'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/callbacks.rb:256:in `destroy'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/transactions.rb:235:in `destroy'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/transactions.rb:292:in `with_transaction_returning_status'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/abstract/database_statements.rb:139:in `transaction'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/transactions.rb:207:in `transaction'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/transactions.rb:290:in `with_transaction_returning_status'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/transactions.rb:235:in `destroy'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/associations.rb:1614:in `has_many_dependent_destroy_for_instances'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/associations/association_collection.rb:431:in `method_missing'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/associations/association_proxy.rb:220:in `method_missing'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/associations/association_proxy.rb:220:in `each'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/associations/association_proxy.rb:220:in `send'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/associations/association_proxy.rb:220:in `method_missing'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/associations/association_collection.rb:431:in `method_missing'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/associations.rb:1606:in `has_many_dependent_destroy_for_instances'
 /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/callbacks.rb:415:in `_run_destroy_callbacks'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/callbacks.rb:256:in `destroy'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/transactions.rb:235:in `destroy'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/transactions.rb:292:in `with_transaction_returning_status'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/abstract/database_statements.rb:139:in `transaction'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/transactions.rb:207:in `transaction'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/transactions.rb:290:in `with_transaction_returning_status'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/transactions.rb:235:in `destroy'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/associations.rb:1614:in `has_many_dependent_destroy_for_pools'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/associations/association_collection.rb:431:in `method_missing'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/associations/association_proxy.rb:220:in `method_missing'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/associations/association_proxy.rb:220:in `each'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/associations/association_proxy.rb:220:in `send'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/associations/association_proxy.rb:220:in `method_missing'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/associations/association_collection.rb:431:in `method_missing'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/associations.rb:1606:in `has_many_dependent_destroy_for_pools'
 /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/callbacks.rb:415:in `_run_destroy_callbacks'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/callbacks.rb:256:in `destroy'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/transactions.rb:235:in `destroy'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/transactions.rb:292:in `with_transaction_returning_status'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/abstract/database_statements.rb:139:in `transaction'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/transactions.rb:207:in `transaction'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/transactions.rb:290:in `with_transaction_returning_status'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/transactions.rb:235:in `destroy'
 /usr/share/aeolus-conductor/app/controllers/pool_families_controller.rb:94:in `destroy'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_controller/metal/implicit_render.rb:4:in `send_action'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_controller/metal/implicit_render.rb:4:in `send_action'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/abstract_controller/base.rb:150:in `process_action'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_controller/metal/rendering.rb:11:in `process_action'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/abstract_controller/callbacks.rb:18:in `process_action'
 /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/callbacks.rb:446:in `_run__198239375__process_action__988268021__callbacks'
 /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/callbacks.rb:410:in `send'
 /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/callbacks.rb:410:in `_run_process_action_callbacks'
 /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/callbacks.rb:94:in `send'
 /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/callbacks.rb:94:in `run_callbacks'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/abstract_controller/callbacks.rb:17:in `process_action'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_controller/metal/rescue.rb:17:in `process_action'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_controller/metal/instrumentation.rb:30:in `process_action'
 /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/notifications.rb:52:in `instrument'
 /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/notifications/instrumenter.rb:21:in `instrument'
 /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/notifications.rb:52:in `instrument'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_controller/metal/instrumentation.rb:29:in `process_action'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/abstract_controller/base.rb:119:in `process'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/abstract_controller/rendering.rb:41:in `process'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_controller/metal.rb:138:in `dispatch'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_controller/metal.rb:178:in `action'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_dispatch/routing/route_set.rb:62:in `call'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_dispatch/routing/route_set.rb:62:in `dispatch'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_dispatch/routing/route_set.rb:27:in `call'
 /usr/lib/ruby/gems/1.8/gems/rack-mount-0.7.1/lib/rack/mount/route_set.rb:150:in `call'
 /usr/lib/ruby/gems/1.8/gems/rack-mount-0.7.1/lib/rack/mount/code_generation.rb:93:in `recognize'
 /usr/lib/ruby/gems/1.8/gems/rack-mount-0.7.1/lib/rack/mount/code_generation.rb:68:in `optimized_each'
 /usr/lib/ruby/gems/1.8/gems/rack-mount-0.7.1/lib/rack/mount/code_generation.rb:92:in `recognize'
 /usr/lib/ruby/gems/1.8/gems/rack-mount-0.7.1/lib/rack/mount/route_set.rb:141:in `call'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_dispatch/routing/route_set.rb:493:in `call'
 /usr/lib/ruby/gems/1.8/gems/warden-1.0.5/lib/warden/manager.rb:35:in `call'
 /usr/lib/ruby/gems/1.8/gems/warden-1.0.5/lib/warden/manager.rb:34:in `catch'
 /usr/lib/ruby/gems/1.8/gems/warden-1.0.5/lib/warden/manager.rb:34:in `call'
 /usr/lib/ruby/gems/1.8/gems/rack-restful_submit-1.2.1/lib/rack/rack-restful_submit.rb:29:in `call'
 /usr/lib/ruby/gems/1.8/gems/sass-3.1.4/lib/sass/../sass/plugin/rack.rb:54:in `call'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_dispatch/middleware/head.rb:14:in `call'
 /usr/lib/ruby/gems/1.8/gems/rack-1.3.0/lib/rack/methodoverride.rb:24:in `call'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_dispatch/middleware/params_parser.rb:21:in `call'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_dispatch/middleware/flash.rb:182:in `call'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_dispatch/middleware/session/abstract_store.rb:149:in `call'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_dispatch/middleware/cookies.rb:302:in `call'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/query_cache.rb:32:in `call'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/abstract/query_cache.rb:28:in `cache'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/query_cache.rb:12:in `cache'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/query_cache.rb:31:in `call'
 /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/connection_adapters/abstract/connection_pool.rb:354:in `call'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_dispatch/middleware/callbacks.rb:46:in `call'
 /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.10/lib/active_support/callbacks.rb:416:in `_run_call_callbacks'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_dispatch/middleware/callbacks.rb:44:in `call'
 /usr/lib/ruby/gems/1.8/gems/rack-1.3.0/lib/rack/sendfile.rb:102:in `call'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_dispatch/middleware/remote_ip.rb:48:in `call'
 /usr/lib/ruby/gems/1.8/gems/actionpack-3.0.10/lib/action_dispatch/middleware/show_exceptions.rb:47:in `call'
 /usr/lib/ruby/gems/1.8/gems/railties-3.0.10/lib/rails/rack/logger.rb:13:in `call'
 /usr/lib/ruby/gems/1.8/gems/rack-1.3.0/lib/rack/runtime.rb:17:in `call'
 /usr/lib/ruby/gems/1.8/gems/rack-1.3.0/lib/rack/lock.rb:34:in `call'
 /usr/lib/ruby/gems/1.8/gems/railties-3.0.10/lib/rails/application.rb:168:in `call'
 /usr/lib/ruby/gems/1.8/gems/railties-3.0.10/lib/rails/application.rb:77:in `send'
 /usr/lib/ruby/gems/1.8/gems/railties-3.0.10/lib/rails/application.rb:77:in `method_missing'
 /usr/lib/ruby/gems/1.8/gems/rack-1.3.0/lib/rack/urlmap.rb:52:in `call'
 /usr/lib/ruby/gems/1.8/gems/rack-1.3.0/lib/rack/urlmap.rb:46:in `each'
 /usr/lib/ruby/gems/1.8/gems/rack-1.3.0/lib/rack/urlmap.rb:46:in `call'
 /usr/lib/ruby/gems/1.8/gems/thin-1.2.11/lib/thin/connection.rb:84:in `pre_process'
 /usr/lib/ruby/gems/1.8/gems/thin-1.2.11/lib/thin/connection.rb:82:in `catch'
 /usr/lib/ruby/gems/1.8/gems/thin-1.2.11/lib/thin/connection.rb:82:in `pre_process'
 /usr/lib/ruby/gems/1.8/gems/thin-1.2.11/lib/thin/connection.rb:57:in `process'
 /usr/lib/ruby/gems/1.8/gems/thin-1.2.11/lib/thin/connection.rb:42:in `receive_data'
 /usr/lib/ruby/gems/1.8/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run_machine'
 /usr/lib/ruby/gems/1.8/gems/eventmachine-0.12.10/lib/eventmachine.rb:256:in `run'
 /usr/lib/ruby/gems/1.8/gems/thin-1.2.11/lib/thin/backends/base.rb:61:in `start'
 /usr/lib/ruby/gems/1.8/gems/thin-1.2.11/lib/thin/server.rb:159:in `start'
 /usr/lib/ruby/gems/1.8/gems/thin-1.2.11/lib/thin/controllers/controller.rb:86:in `start'
 /usr/lib/ruby/gems/1.8/gems/thin-1.2.11/lib/thin/runner.rb:185:in `send'
 /usr/lib/ruby/gems/1.8/gems/thin-1.2.11/lib/thin/runner.rb:185:in `run_command'
 /usr/lib/ruby/gems/1.8/gems/thin-1.2.11/lib/thin/runner.rb:151:in `run!'
 /usr/lib/ruby/gems/1.8/gems/thin-1.2.11/bin/thin:6
 /usr/bin/thin:19:in `load'
 /usr/bin/thin:19
Rendered layouts/_masthead.html.haml (2.8ms)
Rendered layouts/_new_notification.html.haml (1.0ms)
Rendered layouts/error.rhtml within layouts/application (23.3ms)
Completed 200 OK in 92ms (Views: 24.6ms | ActiveRecord: 10.0ms)



Additional info:
# rpm -qa | grep aeolus
aeolus-conductor-0.8.0-8.el6.noarch
rubygem-aeolus-cli-0.3.0-4.el6.noarch
aeolus-configure-2.5.0-5.el6.noarch
aeolus-conductor-daemons-0.8.0-8.el6.noarch
aeolus-configserver-0.4.5-2.el6.noarch
rubygem-aeolus-image-0.3.0-3.el6.noarch
aeolus-all-0.8.0-8.el6.noarch
aeolus-conductor-doc-0.8.0-8.el6.noarch