This patch works around dereferencing a zero server pointer.

The assumption is that these come from a misconfiguration, and don't
hurt the running server (because the vhost resolution works in the
opposite direction, from server to vhost). It only hurts in the "-S"
command, and that can be avoided by printing a WARNING about the
misconfiguration.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@88211 13f79535-47bb-0310-9956-ffa450edef68