svn_ra_dav__get_one_prop() has a deep bug in it. For the 0.17 release, we'll just tweak around it.
svn_ra_dav__get_one_prop() has a deep bug in it. For the 0.17 release,
we'll just tweak around it.

* libsvn_ra_dav/fetch.c (svn_ra_dav__get_file): if the returned
    checksum value is the empty string, then don't compute a checksum.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion