After some consideration - Location walk is always required (before and
  after any other map_to_storage operations.)  Therefore, initialize any
  NULL r->per_dir_config at this phase (the earliest necessary point.)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@90868 13f79535-47bb-0310-9956-ffa450edef68