Description of problem:
------------------------
The UI blows up with this error while clicking the host->Advanced Settings page.

undefined method `split' for nil:NilClass [host/advanced_settings] 


Snippet from production.log:

[----] F, [2016-01-19T14:59:46.186501 #2934:f95998] FATAL -- : Error caught: [NoMethodError] undefined method `split' for nil:NilClass
/var/www/miq/vmdb/app/models/miq_report/generator.rb:57:in `col_to_expression_col'
/var/www/miq/vmdb/app/models/miq_report/search.rb:40:in `block in get_order_info'
/var/www/miq/vmdb/app/models/miq_report/search.rb:39:in `collect'
/var/www/miq/vmdb/app/models/miq_report/search.rb:39:in `get_order_info'
/var/www/miq/vmdb/app/models/miq_report/search.rb:100:in `paged_view_search'
/var/www/miq/vmdb/app/controllers/application_controller.rb:1750:in `get_view'
/var/www/miq/vmdb/app/controllers/application_controller/ci_processing.rb:541:in `show_details'
/var/www/miq/vmdb/app/controllers/application_controller/ci_processing.rb:2017:in `show_association'
/var/www/miq/vmdb/app/controllers/host_controller.rb:14:in `show_association'
/var/www/miq/vmdb/app/controllers/host_controller.rb:211:in `advanced_settings'
/opt/rh/cfme-gemset/gems/actionpack-4.2.5/lib/action_controller/metal/implicit_render.rb:4:in `send_action'
/opt/rh/cfme-gemset/gems/actionpack-4.2.5/lib/abstract_controller/base.rb:198:in `process_action'
/opt/rh/cfme-gemset/gems/actionpack-4.2.5/lib/action_controller/metal/rendering.rb:10:in `process_action'
/opt/rh/cfme-gemset/gems/actionpack-4.2.5/lib/abstract_controller/callbacks.rb:20:in `block in process_action'
/opt/rh/cfme-gemset/gems/activesupport-4.2.5/lib/active_support/callbacks.rb:117:in `call'
/opt/rh/cfme-gemset/gems/activesupport-4.2.5/lib/active_support/callbacks.rb:117:in `call'
/opt/rh/cfme-gemset/gems/activesupport-4.2.5/lib/active_support/callbacks.rb:555:in `block (2 levels) in compile'
/opt/rh/cfme-gemset/gems/activesupport-4.2.5/lib/active_support/callbacks.rb:505:in `call'
/opt/rh/cfme-gemset/gems/activesupport-4.2.5/lib/active_support/callbacks.rb:505:in `call'
/opt/rh/cfme-gemset/gems/activesupport-4.2.5/lib/active_support/callbacks.rb:92:in `__run_callbacks__'
/opt/rh/cfme-gemset/gems/activesupport-4.2.5/lib/active_support/callbacks.rb:778:in `_run_process_action_callbacks'
/opt/rh/cfme-gemset/gems/activesupport-4.2.5/lib/active_support/callbacks.rb:81:in `run_callbacks'
/opt/rh/cfme-gemset/gems/actionpack-4.2.5/lib/abstract_controller/callbacks.rb:19:in `process_action'
/opt/rh/cfme-gemset/gems/actionpack-4.2.5/lib/action_controller/metal/rescue.rb:29:in `process_action'
/opt/rh/cfme-gemset/gems/actionpack-4.2.5/lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
/opt/rh/cfme-gemset/gems/activesupport-4.2.5/lib/active_support/notifications.rb:164:in `block in instrument'
/opt/rh/cfme-gemset/gems/activesupport-4.2.5/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/opt/rh/cfme-gemset/gems/activesupport-4.2.5/lib/active_support/notifications.rb:164:in `instrument'
/opt/rh/cfme-gemset/gems/actionpack-4.2.5/lib/action_controller/metal/instrumentation.rb:30:in `process_action'
/opt/rh/cfme-gemset/gems/actionpack-4.2.5/lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
/opt/rh/cfme-gemset/gems/activerecord-4.2.5/lib/active_record/railties/controller_runtime.rb:18:in `process_action'
/opt/rh/cfme-gemset/gems/actionpack-4.2.5/lib/abstract_controller/base.rb:137:in `process'


Version-Release number of selected component (if applicable):
------------------
5.5.2.1


How reproducible:
----------------
Always


Steps to Reproduce:
------------------
1.Navigate to the summary page of a host.
2.From the Configuration accordion, click 'Advanced Settings'.
3.Alternatively,click Advanced Settings in the Configuration Section  in the summary page.


Actual results:
---------------
UI blows up


Expected results:
-----------------
No UI error.


Additional info:
----------------