* subversion/libsvn_ra_serf/update.c
  (fetch_file): Following up on r1449564, don't even try to obtain a file
    by just its MD5, as this will just fail.

Found by: zhakov


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1449641 13f79535-47bb-0310-9956-ffa450edef68