Fix request #7257: Fatal error when using search bar on wiki service

Change-Id: Ibd3d82b6aaf25dbbe286220553edd84f4eaffcaf
Merge commit 'refs/changes/93/2793/1' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix request #7257: Fatal error when using search bar on wiki service

Change-Id: Id92ecfe33bfbdbf61f1e32fd8ed7867e85615185
This is Tuleap 7.2.99.65

Change-Id: I94a86ebea3599c4ff95f577b8adef84fc0767bdb