404 after user logged out in different browser

[ljelinkova]

Issue Overview

When user is logged in into 2 browsers and logs out in one of them, he gets 404 page in the other browser. This has been found when investigating issue #4760

Expected Behaviour

User should get some meaningful message that he/she is no longer logged in.

Current Behaviour

User gets 404 page

Steps To Reproduce

1. Open browser A and log into OSIO, do some work
2. Open browser B and log into OSIO, do some work
3. Log out from browser A
4. Click Preferences or Setting (you may need to to that several times)
   RESULT: 404 page is displayed

See #4760 for details why user is logged out from both browsers.