Decorators are correctly removed from database

Change-Id: Ib2728b14fb3a33e13018cf50013e20f8bba60013
Merge commit 'refs/changes/30/430/3' of http://gerrit.tuleap.net/tuleap into stable

* http://gerrit.tuleap.net/tuleap:
  Decorators are correctly removed from database
This is Tuleap 6.0.99.7