fix 我的任务里课程列表修改

pages/myMission/myMission.js

@@ -361,7 +361,7 @@ Page({
         console.log(res,"我的课程")
         if (res.data.code == 0 && res.data.list.length !== 0) {
           this.setData({
-            kcArr: res.data.list,
+            kcArr: res.data.list||[],
             istask3: res.data.allDone,
             currentName: "",
             currentId: null