Added a check to make sure that h_aliases is not NULL before we try to

dereference it in the for(...) loop.  Attempting to dereference a NULL pointer
was causing a fault if there were no aliases found.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94819 13f79535-47bb-0310-9956-ffa450edef68