增加训练任务未选代码分支时错误提示

routers/repo/modelarts.go

@@ -1251,6 +1251,10 @@ func paramCheckCreateTrainJob(form auth.CreateModelArtsTrainJobForm) error {
 		log.Error("the WorkServerNumber(%d) must be in (1,25)", form.WorkServerNumber)
 		return errors.New("计算节点数必须在1-25之间")
 	}
+	if form.BranchName == nil || form.BranchName == "" {
+		log.Error("the branch must not be nil!", form.BranchName)
+		return errors.New("代码分支不能为空！")
+	}
 
 	return nil
 }