Fix request #7192: SOAP artifacts method break if vertical tab is within artifact follow up

Change-Id: I9f99cc88f5d5ceeaaf2f9a25ece05b8f2ebf3b19
Merge commit 'refs/changes/54/2754/1' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix request #7192: SOAP artifacts method break if vertical tab is within artifact follow up
This is Tuleap 7.2.99.35

Change-Id: I68fa98e3ab5043f9fc0c61f6e7cb19da9b1b6da1