Once more with feeling: When filtering self-referential mergeinfo don't discard empty mergeinfo.
Once more with feeling: When filtering self-referential mergeinfo don't
discard empty mergeinfo.

Sound familiar?  r30503 claimed to do this too, it did, but only because
of the bug that is being fixed here.  r30503 also introduced another bug
and was reverted in r30509.

* subversion/libsvn_client/merge.c
  (filter_self_referential_mergeinfo): Don't filter empty svn:mergeinfo.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@870584 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion