Created attachment 1148869 [details]
Screenshot showing actual results

Description of problem:After clicking on 'Cancel' button while reconfiguring selected instance showing an error "Unexpected error encountered" with "undefined method `[]' for nil:NilClass [vm_cloud/resize_vm]" in a cloud provider.


Version-Release number of selected component (if applicable): 5.6.0.1-beta2.20160413141124_e25ac0e


How reproducible: 100%


Steps to Reproduce:
1.Navigate to Clouds --> Instances
2.Select any Instance and Navigate to Configuration --> Reconfigure selected Instance
3.After click on 'Cancel' button 


Actual results:Error text "undefined method `[]' for nil:NilClass [vm_cloud/resize_vm]" is displayed in UI


Expected results:It should be back to the instance page without any error


Additional info:

Production logs:
[----] I, [2016-04-19T07:48:35.815450 #12703:eba76c]  INFO -- : Started POST "/vm_cloud/resize_vm/7000000000277?button=cancel" for 127.0.0.1 at 2016-04-19 07:48:35 -0400
[----] I, [2016-04-19T07:48:35.818074 #12703:eba76c]  INFO -- : Processing by VmCloudController#resize_vm as JS
[----] I, [2016-04-19T07:48:35.818180 #12703:eba76c]  INFO -- :   Parameters: {"button"=>"cancel", "id"=>"7000000000277"}
[----] F, [2016-04-19T07:48:35.953856 #12703:eba76c] FATAL -- : Error caught: [NoMethodError] undefined method `[]' for nil:NilClass
/var/www/miq/vmdb/app/controllers/vm_cloud_controller.rb:41:in `resize_vm'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_controller/metal/basic_implicit_render.rb:4:in `send_action'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/abstract_controller/base.rb:181:in `process_action'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_controller/metal/rendering.rb:30:in `process_action'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/abstract_controller/callbacks.rb:20:in `block in process_action'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/activesupport/lib/active_support/callbacks.rb:126:in `call'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/activesupport/lib/active_support/callbacks.rb:126:in `call'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/activesupport/lib/active_support/callbacks.rb:506:in `block (2 levels) in compile'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/activesupport/lib/active_support/callbacks.rb:455:in `call'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/activesupport/lib/active_support/callbacks.rb:455:in `call'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/activesupport/lib/active_support/callbacks.rb:101:in `__run_callbacks__'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/activesupport/lib/active_support/callbacks.rb:750:in `_run_process_action_callbacks'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/activesupport/lib/active_support/callbacks.rb:90:in `run_callbacks'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/abstract_controller/callbacks.rb:19:in `process_action'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_controller/metal/rescue.rb:31:in `process_action'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/activesupport/lib/active_support/notifications.rb:164:in `block in instrument'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/activesupport/lib/active_support/notifications/instrumenter.rb:21:in `instrument'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/activesupport/lib/active_support/notifications.rb:164:in `instrument'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_controller/metal/instrumentation.rb:30:in `process_action'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_controller/metal/params_wrapper.rb:248:in `process_action'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/activerecord/lib/active_record/railties/controller_runtime.rb:18:in `process_action'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/abstract_controller/base.rb:126:in `process'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionview/lib/action_view/rendering.rb:30:in `process'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_controller/metal.rb:190:in `dispatch'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_controller/metal.rb:262:in `dispatch'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_dispatch/routing/route_set.rb:50:in `dispatch'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_dispatch/routing/route_set.rb:32:in `serve'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_dispatch/journey/router.rb:39:in `block in serve'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_dispatch/journey/router.rb:26:in `each'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_dispatch/journey/router.rb:26:in `serve'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_dispatch/routing/route_set.rb:739:in `call'
/opt/rh/cfme-gemset/gems/omniauth-1.3.1/lib/omniauth/strategy.rb:186:in `call!'
/opt/rh/cfme-gemset/gems/omniauth-1.3.1/lib/omniauth/strategy.rb:164:in `call'
/opt/rh/cfme-gemset/gems/omniauth-1.3.1/lib/omniauth/builder.rb:63:in `call'
/opt/rh/cfme-gemset/gems/secure_headers-3.0.3/lib/secure_headers/middleware.rb:10:in `call'
/opt/rh/cfme-gemset/gems/rack-2.0.0.alpha/lib/rack/etag.rb:25:in `call'
/opt/rh/cfme-gemset/gems/rack-2.0.0.alpha/lib/rack/conditional_get.rb:38:in `call'
/opt/rh/cfme-gemset/gems/rack-2.0.0.alpha/lib/rack/head.rb:12:in `call'
/opt/rh/cfme-gemset/gems/rack-2.0.0.alpha/lib/rack/session/abstract/id.rb:220:in `context'
/opt/rh/cfme-gemset/gems/rack-2.0.0.alpha/lib/rack/session/abstract/id.rb:214:in `call'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_dispatch/middleware/cookies.rb:613:in `call'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_dispatch/middleware/callbacks.rb:38:in `block in call'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/activesupport/lib/active_support/callbacks.rb:97:in `__run_callbacks__'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/activesupport/lib/active_support/callbacks.rb:750:in `_run_call_callbacks'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/activesupport/lib/active_support/callbacks.rb:90:in `run_callbacks'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_dispatch/middleware/callbacks.rb:36:in `call'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_dispatch/middleware/remote_ip.rb:79:in `call'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_dispatch/middleware/debug_exceptions.rb:49:in `call'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/railties/lib/rails/rack/logger.rb:36:in `call_app'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/railties/lib/rails/rack/logger.rb:26:in `call'
/opt/rh/cfme-gemset/gems/request_store-1.3.1/lib/request_store/middleware.rb:9:in `call'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_dispatch/middleware/request_id.rb:24:in `call'
/opt/rh/cfme-gemset/gems/rack-2.0.0.alpha/lib/rack/method_override.rb:22:in `call'
/opt/rh/cfme-gemset/gems/rack-2.0.0.alpha/lib/rack/runtime.rb:22:in `call'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/activesupport/lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/actionpack/lib/action_dispatch/middleware/executor.rb:12:in `call'
/opt/rh/cfme-gemset/gems/rack-2.0.0.alpha/lib/rack/sendfile.rb:111:in `call'
/opt/rh/cfme-gemset/bundler/gems/rails-efaa6e4f79d4/railties/lib/rails/engine.rb:522:in `call'
/opt/rh/rh-ruby22/root/usr/share/gems/gems/puma-3.3.0/lib/puma/configuration.rb:224:in `call'
/opt/rh/rh-ruby22/root/usr/share/gems/gems/puma-3.3.0/lib/puma/server.rb:561:in `handle_request'
/opt/rh/rh-ruby22/root/usr/share/gems/gems/puma-3.3.0/lib/puma/server.rb:406:in `process_client'
/opt/rh/rh-ruby22/root/usr/share/gems/gems/puma-3.3.0/lib/puma/server.rb:271:in `block in run'
/opt/rh/rh-ruby22/root/usr/share/gems/gems/puma-3.3.0/lib/puma/thread_pool.rb:111:in `call'
/opt/rh/rh-ruby22/root/usr/share/gems/gems/puma-3.3.0/lib/puma/thread_pool.rb:111:in `block in spawn_thread'