Fix request #6880: XML Export from Tv3: MSB with users might have 2 as data type

Change-Id: Icb72052c2b479ba8163fe6f2364375e3d96705e3
Merge commit 'refs/changes/45/2445/6' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix request #6880: XML Export from Tv3: MSB with users might have 2 as data type

Change-Id: Ib72ba2eb5d9e2950a7161a29cece835e5ae80fb7
Tuleap 7.0.99.47

Change-Id: Ie0c250337838ae76c745926a246172598196c281