删除了对应代码分支的启动文件之后点击修改仍可以创建云脑2训练任务

复现步骤：

选择master分支、启动文件train.py，成功创建云脑2训练任务taskA
删除master分支的train.py文件，在taskA详情页面点击修改，直接提交
期望结果：创建训练任务新版本失败
实际结果：创建训练任务新版本成功

如果直接通过新建训练任务按钮，选择master分支、启动文件train.py来创建任务，会报错“启动文件错误”。
这才是期望结果。

可测试

通过测试，关闭此单。

Deleting a branch is permanent. It CANNOT be undone. Continue?

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#924 删除了对应代码分支的启动文件之后点击修改仍可以创建云脑2训练任务