GPII-722: Fixing problem with blank sentences.

http://issues.gpii.net/browse/GPII-722
@dimokas please take a look at the line numbers I mentioned above. The logout clears the text but doesn't hide the element. Try these steps.
1. use the "Save and Apply" button to create a user and login.
2. use the "Logout" link at the top to log the user out
3. Navigate to the bottom of the PMT where the messages would have been displayed. 

I noticed that this still produced "Blank" in NVDA.