Fix request 5424: Cross Tracker Search gives a blank page

Change-Id: I64c950260d6ba65f8b30d8160bc8e529ce74dec0
Merge commit 'refs/changes/13/1313/2' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix request 5424: Cross Tracker Search gives a blank page

Change-Id: Ia244a8346cb32b3cb9e30c8e8b2b198e59973b32
Tuleap 6.6.99.1

Change-Id: Ie77a20fef06e47094b3f8ec58871350cae586d52