Fix request 6102 - JS error on 'tagName' on cardwall renderer

Change-Id: Ibd87a7b82b9755ffe13285fc548785b92de0c864
Merge commit 'refs/changes/24/1824/1' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix request 6102 - JS error on 'tagName' on cardwall renderer

Change-Id: Iefe49f64f31bd57c3287b36b1b873e06b4298409
Tuleap 6.9.99.51

Change-Id: Ie160c4fad721b3a418733778fff563e392bdfda3