Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=55811
Do not parse web-fragment.xml files when an empty absolute-ordering element is present.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1548967 13f79535-47bb-0310-9956-ffa450edef68