Reinstate the render of this error to the UI.

- May need to remove/refactor this later, hence the separate commit.

Author: hezzimo

app/controllers/application_controller.rb

@@ -43,9 +43,10 @@ def notify_bad_request(exception)
       ERROR
 
       Rails.logger.debug("#{error}, code: #{exception.code}")
+      render plain: error, status: :bad_request
+    else
+      raise
     end
-
-    raise
   end
 
   def require_govuk_editor(redirect_path: root_path)