(bug 22317) Do not prevent unification if home wiki is blocked

This check didn't make to much sense as right now it's by far
easier for stewards to stop a vandal using one global account
than having to deal with several local ones.

Change-Id: I32384d6423d3cb633f99cdcd2745f8ce6d8c597e
Merge "(bug 22317) Do not prevent unification if home wiki is blocked"