SECURITY: CVE-2010-1452 (cve.mitre.org)

mod_dav: Fix Handling of requests without a path segment.
(mod_cache and mod_session portions don't apply to 2.0.x)

PR: 49246 
Backports: r966348
Submitted by: Mark Drayton, trawick
Reviewed by: wrowe, rjung

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@1005655 13f79535-47bb-0310-9956-ffa450edef68