Merge pull request '增加训练任务未选代码分支时页面提示错误' (#1274) from fix-1140 into V20220110

Reviewed-on: https://git.openi.org.cn/OpenI/aiforge/pulls/1274
Reviewed-by: lewis <747342561@qq.com>

routers/repo/modelarts.go

@@ -1256,6 +1256,10 @@ 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 == "" {
+		log.Error("the branch must not be null!", form.BranchName)
+		return errors.New("代码分支不能为空！")
+	}
 
 	return nil
 }