Fix request #7523 Docman import from v1 block when users are deleted

Change-Id: I2fa7b32946afc39e49a0b7787250ce621f340e6c
Merge commit 'refs/changes/23/3123/1' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix request #7523 Docman import from v1 block when users are deleted
This is Tuleap 7.5.99.70

Change-Id: Ia2e3223f4bf2f3b26159b43564d5646850a398cb