fix the case when a server doesn't send a response string

Submitted by:	Brett Hutley <brett@hutley.net> J.D. Silvester <jsilves@uwo.ca>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@96469 13f79535-47bb-0310-9956-ffa450edef68