* Prevent a segfault when a CGI script sets a cookie with a null value.

Submitted by: David Shane Holden <dpejesh apache.org>
Reviewed by: rpluem


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@678160 13f79535-47bb-0310-9956-ffa450edef68