The code for ErrorDocument did not take into account the pre-1.2

changes to how index_of_response handles errors.  This patch fixes
that as well as removing the reported problem of stripping a trailing
double-quote character.

Reviewed by: Dean Gaudet, Chuck Murcko


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@77475 13f79535-47bb-0310-9956-ffa450edef68