Stop unsetting the 'empty' query string result with

  a NULL argument in ecb->lpszQueryString, eliminating segfaults
  for some ISAPI modules.

PR: 14399
Submitted by:	Detlev Vendt <detlev.vendt@brillit.de>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@97468 13f79535-47bb-0310-9956-ffa450edef68