fixbug

modules/mogo-trafficlive/src/main/java/com/mogo/cloud/trafficlive/core/TrafficLiveCurrentManager.java

@@ -99,6 +99,14 @@ public class TrafficLiveCurrentManager
     }
 
     private void onVehicleLiveSuccess(String liveSn, SurfaceView surfaceView) {
+        if (TextUtils.isEmpty(liveSn)) {
+            if (TrafficLiveCurrentManager.this.trafficLiveCallBack != null) {
+                TrafficLiveCurrentManager.this.trafficLiveCallBack.onError("There are no live vehicles ahead !");
+            } else {
+                Logger.e(TAG, "onVehicleLiveSuccess , but result liveSn is null");
+            }
+            return;
+        }
         String sn = MoGoAiCloudClient.getInstance().getAiCloudClientConfig().getSn();
         // 初始化配置文件
         MoGoLivePushConfig mLivePushConfig = MoGoLivePushConfig.getInstance();