* mod_dav.c (dav_handle_err): look through the error stack for some

    kind of errortag.  any buried errortag is better than a generic
    response.

Submitted by: Ben Collins-Sussman <sussman@collab.net>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93786 13f79535-47bb-0310-9956-ffa450edef68