3235: Don't blow up when calling 404 from ActionsController.

3235: Don't blow up when calling 404 from ActionsController.

Before:

  At .../app/views/application/404.html.erb:17
  #<ActionController::UrlGenerationError: No route matches {:action=>"index", :controller=>"actions"}>

After:

  Use the class_name deduced from the uuid to determine the most
  likely controller, instead of assuming the current controller is the
  right one.