When editing a filter for the "Miscellaneous" (i.e. blank) resource_type, the following error occurs:

ActionView::Template::Error (undefined method `pluralize' for nil:NilClass):
    45: 
    46:         <%= autocomplete_f f, :search,
    47:                            :disabled => f.object.unlimited?,
    48:                            :path => resource_path(f.object.resource_type), :control_group_id => 'search_group' %>
    49:       </div>
    50:     </div>
    51: 
  app/helpers/filters_helper.rb:20:in `resource_path'
  app/views/filters/_form.html.erb:48:in `block in _b45b2ae2fba8a33ed854c14ac1956876'
  app/helpers/layout_helper.rb:246:in `form_for'
  app/views/filters/_form.html.erb:3:in `_b45b2ae2fba8a33ed854c14ac1956876'
  app/views/filters/edit.html.erb:3:in `_f35aa42ef6859ffae5b73ffa5586d845'
  app/models/concerns/foreman/thread_session.rb:33:in `clear_thread'
  lib/middleware/catch_json_parse_errors.rb:9:in `call'