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 probably segfault, too (if no previous container exists).

PR: 17093


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@98671 13f79535-47bb-0310-9956-ffa450edef68