ErrorDocument 404 pointing to a parsed html file with a

<!--#include virtual="file" --> with a request URI containing
%2f would result in a segfault (NULL pointer deref, not a
security problem).

PR:		8362


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@91097 13f79535-47bb-0310-9956-ffa450edef68