Description of problem:
When browsing to  Services -> Requests the customer is experiencing a template error that prevents their users from accessing the details of the users

Version-Release number of selected component (if applicable):
5.8.0.17

How reproducible:
all the time on affected appliance

Steps to Reproduce:
1.log in as any user (logs show non-admin user)
2.go to service => request
3.

Actual results:
 FATAL -- : Error caught: [ActionView::Template::Error] undefined method `split' for 1:Fixnum
/opt/rh/cfme-gemset/bundler/gems/manageiq-ui-classic-1048ffdbd63f/app/helpers/application_helper/dialogs.rb:18:in `dialog_dropdown_selected_value'
/opt/rh/cfme-gemset/bundler/gems/manageiq-ui-classic-1048ffdbd63f/app/views/shared/dialogs/_dialog_field_drop_down_list.html.haml:39:in `__opt_rh_cfme_gemset_bundler_gems_manageiq_ui_classic_____ffdbd__f_app_views_shared_dialogs__dialog_field_drop_down_list_html_haml__3246338562607631390_180551940'
/opt/rh/cfme-gemset/gems/actionview-5.0.3/lib/action_view/template.rb:159:in `block in render'


Expected results:
the error does not happen and the data is displayed

Additional info:
full logs attached privately