Merge branch 'feature/jiucuo-set' into testing

product-set/src/views/jiucuo-set/index.vue

@@ -244,7 +244,7 @@ export default {
     getClassData(val) {
       getClass(getFormData({ grade: val })).then((res) => {
         this.classList = res.result;
-        this.classList.forEach((item) => {
+        this.classList?.forEach((item) => {
           this.classIdArr.push(item.class_id);
         });
         if (!this.bookName) {