/kind bug

What steps did you take and what happened:
[A clear and concise description of what the bug is.]
Katib experiment detail page can be accessed after a given namespace (non default one) is chosen, however, upon page refresh or direct access page URL e.g https://service-name/katib/experiment/exp-name, UI will throw out 500 error.

By checking the requested URL, it seems that the actual API request sent is https://service-name/katib/fetch_hp_job_info/?experimentName=exp-name&namespace=kubeflow-user where the namespace is default to namespace=kubeflow-user.

What did you expect to happen:

The experiment detail page should able to refresh and directly accessible.

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

Environment:

• Katib version (check the Katib controller image version): v0.13.0
• Kubernetes version: (kubectl version): N/A
• OS (uname -a): N/A

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