Cloned from https://bugzilla.redhat.com/show_bug.cgi?id=1335799
Description of problem:
Notification error is shown correctly when I do wrong action on the page, but once I try to open the same page and do the same action, it stopped to show

Version-Release number of selected component (if applicable):
6.2 GA SNAP11

How reproducible:
Always

Steps to Reproduce:
1. Go to Settings page
2. Try to edit 'Entries per page' setting to invalid value (e.g. 'test')
3. Notification error is displayed. Close it
4. Go to Settings page once again
5. Try to edit same setting to the same value

Actual results:
Nothing happen, when I perform wrong action on the page

Expected results:
Notification error should be shown all the time

Additional info: