tasks #6829 - At the end, send email to requester with the stack trace

Change-Id: Iabd41d66a14c67df4066b933b912dcec412cf4cb
Merge commit 'refs/changes/82/2482/1' of http://gerrit.tuleap.net/tuleap into HEAD

* http://gerrit.tuleap.net/tuleap:
  tasks #6829 - At the end, send email to requester with the stack trace

Change-Id: I9eac3c2f406381ad15e919b11b8b7e357076d4ac
This is Tuleap 7.0.99.35

Change-Id: Ic81ad561929a8f03d84e37b20a8976721349fa2c