merge this from 2.1-dev:

   Restore the ability to add a description for directories that
   don't contain an index file.  (Broken in 2.0.48)

Submitted by:	nd
Reviewed by:	trawick, striker


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@101980 13f79535-47bb-0310-9956-ffa450edef68