* subversion/libsvn_ra_dav/fetch.c (fetch_file): Pass NULL to   simple_fetch_file if no checksum is available; old repositories   may not have checksums.
* subversion/libsvn_ra_dav/fetch.c (fetch_file): Pass NULL to
  simple_fetch_file if no checksum is available; old repositories
  may not have checksums.

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