does not allow anonymous users to reply to a ML

second way to redirect

refactor

remove useless $user var

Change-Id: Ib24b35e55d1402e64c8a9d287464ba8f7ea152f6
Merge commit 'refs/changes/67/267/3' of http://gerrit.tuleap.net/tuleap into tuleap-stable-master

* http://gerrit.tuleap.net/tuleap:
  does not allow anonymous users to reply to a ML
Tuleap 5.10.99.28