story #6083 : fix JS error on IE

Change-Id: I7ef5a112c5b76bd6b6d754fe23d6a71f8053f848
Merge commit 'refs/changes/25/2025/3' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  story #6083 : fix JS error on IE

Change-Id: I90018d2c85d109441001ec12bdd2b6e643e8ea35
This is Tuleap 6.10.99.67

Change-Id: I71fe63b9d53936538f23939fdbb27da130f928bd