request #6372: fix modal when there is no title

Change-Id: I96ea54edc4fa6dcd5c08e67935f2152adca9eda0
Merge commit 'refs/changes/34/2034/1' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  request #6372: fix modal when there is no title

Change-Id: I72814de32f51f944b6056f1dbcc4db1a5151f85d
Tuleap 6.10.99.77

Change-Id: I8aefac7505c309d08943a1149bb6fc57d14bc235