Fix a bug in the EXEC_ON_READ logic. When we build a sub_tree while

reading that is the first item in a container, we have to return that tree
and set the parent pointers correctly.
Submitted by:	Jeff Trawick
Reviewed by:	Ryan Bloom


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85233 13f79535-47bb-0310-9956-ffa450edef68