feat:修改分班没数据保存

src/views/educational/division/components/DsionStep2_1.vue

@@ -211,6 +211,10 @@
       postData.push(dataItem);
     });
     try {
+      if (postData.length === 0) {
+        createMessage.warning('请请先添加班级信息');
+        return;
+      }
       await putBandingBandingTaskClass(postData);
       createMessage.success('保存成功');
       reload();