Check self.__sock before dispatch, See #1513
Check self.__sock before dispatch, See #1513

cloudwu/skynet,sanikoyes/skynet,cloudwu/skynet,wangyi0226/skynet,wangyi0226/skynet,xjdrew/skynet,sanikoyes/skynet,korialuo/skynet,xjdrew/skynet,wangyi0226/skynet,korialuo/skynet,cloudwu/skynet,xjdrew/skynet,korialuo/skynet,sanikoyes/skynet