tasks #6648: Artifact counter is broken in artifact link

Change-Id: I17c96539572196c8064deff6a785cc8892ee902f
Merge commit 'refs/changes/59/2259/1' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #6648: Artifact counter is broken in artifact link
This is Tuleap 6.12.99.19

Change-Id: I308e5409d4ec16aa94e1f4a0078b3598120e38a9