If getXSModel was invoked when schema caching was off and nothing had changed,...

If getXSModel was invoked when schema caching was off and nothing had changed, a new (empty) model was created even if a non-empty one was already available


git-svn-id: https://svn.apache.org/repos/asf/xerces/c/trunk@176018 13f79535-47bb-0310-9956-ffa450edef68