Added handled of invlid drawable bounding boxes.
Added handled of invlid drawable bounding boxes.


ntoand/osg,XiaoCC/osg,XiaoCC/osg,koshman86/osg,stmh/osg,artoolkit/osg,artoolkit/osg,ntoand/osg,stmh/osg,omega-hub/osg,koshman86/osg,ghub/osg,omega-hub/osg,stmh/osg,ntoand/osg,stmh/osg,XiaoCC/osg,koshman86/osg,XiaoCC/osg,XiaoCC/osg,artoolkit/osg,koshman86/osg,stmh/osg,omega-hub/osg,ntoand/osg,ghub/osg,ghub/osg,omega-hub/osg,ghub/osg,artoolkit/osg