* subversion/libsvn_client/auth.c
* subversion/libsvn_client/auth.c

  (get_username, get_password): Fix logic oversight.  Allow for NULL
  auth cache directory.

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