* subversion/libsvn_ra_serf/lock.c   (svn_ra_serf__unlock): Following up on r1578311, remove the now invalid     assumption that serf's get_lock will always return a lock instance,     even when a node isn't locked.
* subversion/libsvn_ra_serf/lock.c
  (svn_ra_serf__unlock): Following up on r1578311, remove the now invalid
    assumption that serf's get_lock will always return a lock instance,
    even when a node isn't locked.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1578326 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion