Merge r1675103 from trunk:

If a directory exists but no indexes can be resolved, the fallback resource
should be attempted first before giving up.

Submitted By: Jack <tjerk.meesters gmail.com> , covener
Committed By: covener


Submitted by: covener
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1677186 13f79535-47bb-0310-9956-ffa450edef68