Fix request #6247: Forum flat view displays same author for all messages

Change-Id: Ia6e723967380484038eb6e32a2136027a8912200
Merge commit 'refs/changes/36/1936/1' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix request #6247: Forum flat view displays same author for all messages

Change-Id: I9060399e7148eb82c9c33361d30e4fecaa5aee5a
This is Tuleap 6.10.99.27

Change-Id: Iffd42048881536a4f40c723e41c29e4d12c92fea