Created attachment 1326437 [details]
screenshot

Description of problem:


Version-Release number of selected component (if applicable):
Version 5.7.4.0.20170913182424_63a1e18

How reproducible:
100%

Steps to Reproduce:
1.Go to configuration-> Access Control accordion->Tenants
2.Go to Tag Assignment page -> Assign tag and Click on reset button 


Actual results:


Expected results:


Additional info:

Production Log:

[----] I, [2017-09-15T07:57:54.604532 #13122:7f6ffc]  INFO -- : Started POST "/ops/rbac_tags_edit/1?button=reset" for 127.0.0.1 at 2017-09-15 07:57:54 -0400
[----] I, [2017-09-15T07:57:54.606898 #13122:7f6ffc]  INFO -- : Processing by OpsController#rbac_tags_edit as JS
[----] I, [2017-09-15T07:57:54.606983 #13122:7f6ffc]  INFO -- :   Parameters: {"button"=>"reset", "id"=>"1"}
[----] F, [2017-09-15T07:57:54.625382 #13122:7f6ffc] FATAL -- : Error caught: [NoMethodError] undefined method `constantize' for nil:NilClass
/var/www/miq/vmdb/app/controllers/ops_controller/ops_rbac.rb:579:in `rbac_edit_tags_reset'
/var/www/miq/vmdb/app/controllers/ops_controller/ops_rbac.rb:27:in `rbac_tags_edit'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_controller/metal/basic_implicit_render.rb:4:in `send_action'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/abstract_controller/base.rb:188:in `process_action'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_controller/metal/rendering.rb:30:in `process_action'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/abstract_controller/callbacks.rb:20:in `block in process_action'
/opt/rh/cfme-gemset/gems/activesupport-5.0.3/lib/active_support/callbacks.rb:126:in `call'
/opt/rh/cfme-gemset/gems/activesupport-5.0.3/lib/active_support/callbacks.rb:506:in `block (2 levels) in compile'
/opt/rh/cfme-gemset/gems/activesupport-5.0.3/lib/active_support/callbacks.rb:455:in `call'
/opt/rh/cfme-gemset/gems/activesupport-5.0.3/lib/active_support/callbacks.rb:101:in `__run_callbacks__'
/opt/rh/cfme-gemset/gems/activesupport-5.0.3/lib/active_support/callbacks.rb:750:in `_run_process_action_callbacks'
/opt/rh/cfme-gemset/gems/activesupport-5.0.3/lib/active_support/callbacks.rb:90:in `run_callbacks'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/abstract_controller/callbacks.rb:19:in `process_action'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_controller/metal/rescue.rb:20:in `process_action'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
/opt/rh/cfme-gemset/gems/activesupport-5.0.3/lib/active_support/notifications.rb:164:in `block in instrument'
/opt/rh/cfme-gemset/gems/activesupport-5.0.3/lib/active_support/notifications/instrumenter.rb:21:in `instrument'
/opt/rh/cfme-gemset/gems/activesupport-5.0.3/lib/active_support/notifications.rb:164:in `instrument'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_controller/metal/instrumentation.rb:30:in `process_action'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_controller/metal/params_wrapper.rb:248:in `process_action'
/opt/rh/cfme-gemset/gems/activerecord-5.0.3/lib/active_record/railties/controller_runtime.rb:18:in `process_action'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/abstract_controller/base.rb:126:in `process'
/opt/rh/cfme-gemset/gems/actionview-5.0.3/lib/action_view/rendering.rb:30:in `process'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_controller/metal.rb:190:in `dispatch'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_controller/metal.rb:262:in `dispatch'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_dispatch/routing/route_set.rb:50:in `dispatch'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_dispatch/routing/route_set.rb:32:in `serve'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_dispatch/journey/router.rb:39:in `block in serve'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_dispatch/journey/router.rb:26:in `each'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_dispatch/journey/router.rb:26:in `serve'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_dispatch/routing/route_set.rb:725: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-2.0.3/lib/rack/etag.rb:25:in `call'
/opt/rh/cfme-gemset/gems/rack-2.0.3/lib/rack/conditional_get.rb:38:in `call'
/opt/rh/cfme-gemset/gems/rack-2.0.3/lib/rack/head.rb:12:in `call'
/opt/rh/cfme-gemset/gems/rack-2.0.3/lib/rack/session/abstract/id.rb:232:in `context'
/opt/rh/cfme-gemset/gems/rack-2.0.3/lib/rack/session/abstract/id.rb:226:in `call'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_dispatch/middleware/cookies.rb:613:in `call'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_dispatch/middleware/callbacks.rb:38:in `block in call'
/opt/rh/cfme-gemset/gems/activesupport-5.0.3/lib/active_support/callbacks.rb:97:in `__run_callbacks__'
/opt/rh/cfme-gemset/gems/activesupport-5.0.3/lib/active_support/callbacks.rb:750:in `_run_call_callbacks'
/opt/rh/cfme-gemset/gems/activesupport-5.0.3/lib/active_support/callbacks.rb:90:in `run_callbacks'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_dispatch/middleware/callbacks.rb:36:in `call'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_dispatch/middleware/remote_ip.rb:79:in `call'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_dispatch/middleware/debug_exceptions.rb:49:in `call'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
/opt/rh/cfme-gemset/gems/railties-5.0.3/lib/rails/rack/logger.rb:36:in `call_app'
/opt/rh/cfme-gemset/gems/railties-5.0.3/lib/rails/rack/logger.rb:26:in `call'
/opt/rh/cfme-gemset/gems/request_store-1.3.2/lib/request_store/middleware.rb:9:in `call'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_dispatch/middleware/request_id.rb:24:in `call'
/opt/rh/cfme-gemset/gems/rack-2.0.3/lib/rack/method_override.rb:22:in `call'
/opt/rh/cfme-gemset/gems/rack-2.0.3/lib/rack/runtime.rb:22:in `call'
/opt/rh/cfme-gemset/gems/activesupport-5.0.3/lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
/opt/rh/cfme-gemset/gems/actionpack-5.0.3/lib/action_dispatch/middleware/executor.rb:12:in `call'
/opt/rh/cfme-gemset/gems/rack-2.0.3/lib/rack/sendfile.rb:111:in `call'
/opt/rh/cfme-gemset/gems/railties-5.0.3/lib/rails/engine.rb:522:in `call'
/opt/rh/rh-ruby23/root/usr/share/gems/gems/puma-3.3.0/lib/puma/configuration.rb:224:in `call'
/opt/rh/rh-ruby23/root/usr/share/gems/gems/puma-3.3.0/lib/puma/server.rb:561:in `handle_request'
/opt/rh/rh-ruby23/root/usr/share/gems/gems/puma-3.3.0/lib/puma/server.rb:406:in `process_client'
/opt/rh/rh-ruby23/root/usr/share/gems/gems/puma-3.3.0/lib/puma/server.rb:271:in `block in run'
/opt/rh/rh-ruby23/root/usr/share/gems/gems/puma-3.3.0/lib/puma/thread_pool.rb:111:in `block in spawn_thread'
[----] I, [2017-09-15T07:57:54.626599 #13122:7f6ffc]  INFO -- :   Rendered layouts/_exception_contents.html.haml (0.2ms)
[----] I, [2017-09-15T07:57:54.627106 #13122:7f6ffc]  INFO -- : Completed 200 OK in 20ms (Views: 1.3ms | ActiveRecord: 1.3ms)