check whether <parentdocument> contains text(nodes).

this allows documents to set the href of the top left left-arrow
without adding a breadcrumb link. This feature primarily intended for
directory index files.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@97548 13f79535-47bb-0310-9956-ffa450edef68