Fix mod_dav_svn bug which prevented old clients from committing to new server.
Fix mod_dav_svn bug which prevented old clients from committing to new server.

* subversion/mod_dav_svn/version.c 
  (build_lock_hash): if there's no svn namespace in the merge request,
    it can't possibly have any lock tokens.  Just punt, rather than
    throwing an error.

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