修复第三方消息通道报错的问题

@@ -63,7 +63,7 @@ export default class MessageEntrance extends Emiter {
     super();
     this.lastClassActiveTime=0;//最后一次课堂激活的时间戳
     //sdk 信息
-    GlobalConfig.sdkVersion = "v2.38.5.201712011";
+    GlobalConfig.sdkVersion = "v2.38.6.201712013";
     loger.warn("sdkVersion:" + GlobalConfig.sdkVersion);
     console.log("sdkVersion:" + GlobalConfig.sdkVersion);
     //设置

@@ -91,7 +91,7 @@ class MessengerMoudle {
       if (typeof _msg == 'object' && _msg.data) {
         msgData = _msg.data;
       }
-
+      if(msgData){
         let msgPairs = msgData.split('__Messenger__');
         let msg1 = msgPairs[1];
         let pairs = msgPairs[0].split('|');
@@ -103,6 +103,8 @@ class MessengerMoudle {
             self.listenFunc[i](msg1);
           }
         }
+      }
+
     };
 
     if (this.supportPostMessage) {

@@ -896,7 +896,6 @@ class WebRtcApe extends Emiter {
     if (_params.videoResolution) {
       this.videoResolution = _params.videoResolution || this.videoResolution;//默认是240P 	20	320x240	15	200
     }
-
     clearTimeout(this.changeDevicesDelay);
     this.changeDevicesDelay = setTimeout(()=> {
       this.changePublishStatusAndServerRecord(WebRtcApe.RECORD_STATUS_0);

@@ -80,6 +80,7 @@ window.Messenger = (function () {
         msg = msg.data;
       }
 
+      if(msg){
         var msgPairs = msg.split('__Messenger__');
         var msg = msgPairs[1];
         var pairs = msgPairs[0].split('|');
@@ -91,6 +92,8 @@ window.Messenger = (function () {
             self.listenFunc[i](msg);
           }
         }
+      }
+
     };
 
     if (supportPostMessage) {