124999: - call <SwGrfNode::onGraphicChanged()> only when <Graphic> instance has been set, too
        - <SwGrfNode::onGraphicChanged()> - assure that graphic is swapped out in case its swap in has been triggered by this method.



git-svn-id: https://svn.apache.org/repos/asf/openoffice/trunk@1600863 13f79535-47bb-0310-9956-ffa450edef68