Followup to r1203546, restore the partial support for nested Locations but issue a warning.
Followup to r1203546, restore the partial support for nested Locations
but issue a warning.

* subversion/mod_dav_svn/mod_dav_svn.c
  (merge_dir_config): Don't set paths to NULL, tweak logged message.

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