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
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