Description of problem:


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


How reproducible:


Steps to Reproduce:
1.Launch few ec2 instances
2.Navigate to filter view->Instances.
3.select any one of the the ec2 instance and click on stop.
  

delatcloud-core log:
New Aws::Ec2 using per_thread-connection mode
thin server (localhost:3002) [deltacloud-mock][7802]: NoMethodError:undefined method `[]' for nil:NilClass
/usr/share/deltacloud-core/bin/../lib/deltacloud/drivers/ec2/ec2_driver.rb:791:in `convert_instance'
/usr/share/deltacloud-core/bin/../lib/deltacloud/drivers/ec2/ec2_driver.rb:186:in `instance'
/usr/share/deltacloud-core/bin/../lib/deltacloud/base_driver/exceptions.rb:151:in `call'
/usr/share/deltacloud-core/bin/../lib/deltacloud/base_driver/exceptions.rb:151:in `safely'
/usr/share/deltacloud-core/bin/../lib/deltacloud/drivers/ec2/ec2_driver.rb:184:in `instance'
/usr/share/deltacloud-core/bin/../lib/deltacloud/helpers/application_helper.rb:93:in `send'
/usr/share/deltacloud-core/bin/../lib/deltacloud/helpers/application_helper.rb:93:in `show'
/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'
/usr/share/deltacloud-core/bin/../lib/deltacloud/helpers/application_helper.rb:92:in `show'
/usr/share/deltacloud-core/bin/../lib/deltacloud/server.rb:468
/usr/share/deltacloud-core/bin/../lib/sinatra/rabbit.rb:125:in `instance_eval'
/usr/share/deltacloud-core/bin/../lib/sinatra/rabbit.rb:125:in `GET /api/instances/:id'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:1151:in `call'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:1151:in `compile!'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:724:in `instance_eval'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:724:in `route_eval'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:708:in `route!'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:758:in `process_route'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:755:in `catch'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:755:in `process_route'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:707:in `route!'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:706:in `each'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:706:in `route!'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:843:in `dispatch!'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:644:in `call!'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:808:in `instance_eval'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:808:in `invoke'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:808:in `catch'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:808:in `invoke'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:644:in `call!'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:629:in `call'
/usr/share/deltacloud-core/bin/../lib/sinatra/rack_syslog.rb:48:in `call'
/usr/share/deltacloud-core/bin/../lib/sinatra/rack_date.rb:31:in `call'
/usr/share/deltacloud-core/bin/../lib/sinatra/rack_accept.rb:149:in `call'
/usr/lib/ruby/gems/1.8/gems/rack-1.3.0/lib/rack/head.rb:9:in `call'
/usr/share/deltacloud-core/bin/../lib/sinatra/rack_driver_select.rb:45:in `call'
/usr/share/deltacloud-core/bin/../lib/sinatra/rack_matrix_params.rb:106:in `call'
/usr/share/deltacloud-core/bin/../lib/sinatra/rack_runtime.rb:36:in `call'
/usr/share/deltacloud-core/bin/../lib/sinatra/rack_etag.rb:41:in `call'
/usr/lib/ruby/gems/1.8/gems/rack-accept-0.4.3/lib/rack/accept/context.rb:22:in `call'
/usr/lib/ruby/gems/1.8/gems/rack-1.3.0/lib/rack/head.rb:9: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/sinatra-1.2.6/lib/sinatra/base.rb:1272:in `call'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:1303:in `synchronize'
/usr/lib/ruby/gems/1.8/gems/sinatra-1.2.6/lib/sinatra/base.rb:1272: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/eventmachine-0.12.10/lib/eventmachine.rb:1060:in `call'
/usr/lib/ruby/gems/1.8/gems/eventmachine-0.12.10/lib/eventmachine.rb:1060:in `spawn_threadpool'
/usr/lib/ruby/gems/1.8/gems/eventmachine-0.12.10/lib/eventmachine.rb:1057:in `initialize'
/usr/lib/ruby/gems/1.8/gems/eventmachine-0.12.10/lib/eventmachine.rb:1057:in `new'
/usr/lib/ruby/gems/1.8/gems/eventmachine-0.12.10/lib/eventmachine.rb:1057:in `spawn_threadpool'
/usr/lib/ruby/gems/1.8/gems/eventmachine-0.12.10/lib/eventmachine.rb:1049:in `defer'
/usr/lib/ruby/gems/1.8/gems/thin-1.2.11/lib/thin/connection.rb:54: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/share/deltacloud-core/bin/deltacloudd:235
/usr/bin/deltacloudd:5:in `load'




Expected result:
This exceptions must be removed.



Additional info:
aeolus-conductor-doc-0.8.0-7.el6.noarch
rubygem-aeolus-image-0.3.0-2.el6.noarch
rubygem-aeolus-cli-0.3.0-3.el6.noarch
aeolus-all-0.8.0-7.el6.noarch
aeolus-conductor-0.8.0-7.el6.noarch
aeolus-configure-2.5.0-4.el6.noarch
aeolus-conductor-daemons-0.8.0-7.el6.noarch