fixing bug in getTrackerStructure() SOAP method request #4076

The server was sending a FatalError back because no workflow was set-up for the tracker

Change-Id: Id469784e2e26cbc88a7866c3536635f1438aba98
Merge commit 'refs/changes/68/568/3' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  fixing bug in getTrackerStructure() SOAP method request #4076

Change-Id: Idc0c1ccd766bca6581f48d418fbc1a718fc24b27
Tuleap 6.1.99.37

Change-Id: I7ce0c97c8c221e37b7d6e6792f039a56cf4a784e
Tuleap 6.2

Change-Id: Ibe49beeaa17433bdea6b503d02d4117ccf0305d8