Handle a non-existent property hash when debugging.
Handle a non-existent property hash when debugging.

* subversion/libsvn_subr/debug.c
  (svn_dbg__print_props): Special-case the NULL props hash.

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