如果action返回的是空，就不反馈ws的消息

core/src/main/java/com/wecloud/dispatch/general/GeneralMessageHandler.java

@@ -46,8 +46,10 @@ public class GeneralMessageHandler {
 		am.setSenderChannel(ctx.channel());
 		am.setSenderClientId(senderClientId);
 		Object res = generalActionDispatcher.action(am);
+		if(res != null) {
 			channelSender.sendMsgLocal((NioSocketChannel)am.getSenderChannel(), res);
 		}
+	}
 
 	public ArgumentBox getArgumentBox() {
 		ArgumentBox beanBox = new DefaultArgumentBox();