Test case which demonstrates that initial bindings and the optimizer can have strange interactions.  Users can write semantically always null queries which return information when initial bindings are used but the optimizer which knows nothing of initial bindings can make assumptions that a query is always null and diverge from user expectations

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1509776 13f79535-47bb-0310-9956-ffa450edef68