Fixed handling of case of no graphics contexts being assigned
Fixed handling of case of no graphics contexts being assigned


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