Merge pull request #72 in ZP/z-push from bugfix/ZP-730-check-internal-notifications-if-states to develop

* commit '0d4b2873':
  ZP-730 Undo change of ZP-631 (enabling notification check again). Check the states integrity before validating the notification. If state has been use, force a sync of the folder.

(cherry picked from commit aeab7567)