Fix bug when updating after csv import.

When doing csv import, previous changeset (initial import) is not
complete therefore the changeset value comparison fails

Change-Id: I98a156c7bb67bdaaf6629cb6660dbd0defa5e5b4
Merge commit 'refs/changes/96/896/1' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix bug when updating after csv import.

Change-Id: Iaf14fa6d4e43f0ba70b49f52f58a6b9ead947a95
This is Tuleap 6.4.99.8

Change-Id: I5017e1c30799517059fa0003740a09ce5f74a7bb