* 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.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@845528 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion