Don't globber scoreboard request info if

read_request_line() fails with a timeout.
In that case there's no new useful request
info available.

Noticed via server-status showing request
"NULL" after keep-alive connections timed out.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1742791 13f79535-47bb-0310-9956-ffa450edef68