优化 index-tree.vue.vm 文件，undefined 修改为 null

fungleo

2020-07-26 ca657b048275fbac4fd13e3c26808ad20e8ea128

 ruoyi-ui/src/views/monitor/job/log.vue

@@ -196,9 +196,7 @@
        jobName: undefined,
        jobGroup: undefined,
        status: undefined
      },
      // 表单参数
      form: {}
      }
    };
  },
  created() {