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.

	cherry-picked from trunk



git-svn-id: https://svn.apache.org/repos/asf/openoffice/branches/AOO410@1603797 13f79535-47bb-0310-9956-ffa450edef68
124999: As Writer graphics are no longer painted via the graphic manager - see <SwNoTxtFrm::PaintPicture(..)> - it is needed to swap out the Writer graphics automatically after a certain amount of time. --> 5000ms

	cherry-picked from trunk



git-svn-id: https://svn.apache.org/repos/asf/openoffice/branches/AOO410@1603799 13f79535-47bb-0310-9956-ffa450edef68