Fix sla #1631: Workflow not applied when there is a default value

Change-Id: I5503968b67729229f61df4e71463f0582ed2a786
Merge commit 'refs/changes/40/340/2' of http://gerrit.tuleap.net/tuleap into stable

* http://gerrit.tuleap.net/tuleap:
  Fix sla #1631: Workflow not applied when there is a default value
This is Tuleap 5.12.99.5