[BUG]在Dashbord提交任务界面进行任务提交失败

[CaRRotOne]

What happened:
在Dashbord提交任务界面进行任务提交失败，提示modelVersion为null,但提交界面里面没有配置modelVersion的地方，返回具体错误如下：
failed to submit job, err: PyTorchJob.training.kubedl.io "pytorchtest" is invalid: spec.modelVersion: Invalid value: "null": spec.modelVersion in body must be of type object: "null"

What you expected to happen:
顺利提交任务
How to reproduce it:
如下图所示

Anything else we need to know?:
通过kubectl提交任务是没问题的
Environment:

• KubeDL version: lastest
• Kubernetes version (use kubectl version): v1.17.17
• OS (e.g: cat /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others:

[jian-he]

this is fixed @CaRRotOne, thanks for reporting !