Merge r1809209 from trunk:

Fix a segmentation fault if AuthzDBDQuery is not set.

PR: 61546
Submitted by: Lubos Uhliarik <luhliari redhat.com>
Reviewed by: jailletc36, ylavic, elukey


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1811749 13f79535-47bb-0310-9956-ffa450edef68