fill out parms->err_directive while looking for open parents.

Otherwise when trying to log the error
(a) we segfault (if the directive was in another file)
(b) we show a wrong occurrence line number (start line of the previous
    container or somewhat) or probably segfault, too
    (if no previous container/directive exists).

PR: 17093
Reviewed by: Jeff Trawick, Bill Stoddard


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@98811 13f79535-47bb-0310-9956-ffa450edef68