When PodDefaults uses only `matchExpressions` getting podDefaults fails.

[michaltreter-identt]

Hi, we have in namespace PodDefaults with only matchExpressions node to find all pods with required label. Unfortunately after that when later we are trying to spin up the notebook, request GET /jupyter/api/namespaces/{namespace}/poddefaults ends up with 500 error. What I can see from the logs:

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/flask/app.py", line 867, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.10/site-packages/flask/app.py", line 852, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
  File "/src/apps/common/routes/get.py", line 37, in get_poddefaults
    label = list(pd["spec"]["selector"]["matchLabels"].keys())[0]
KeyError: 'matchLabels'

Kubeflow manifests repo upstream version: 1.8.1
JupyterWebApp image version: 1.8.0

How about skipping that podDefaults that do not have required node? Also are there any plans for adding support to omiting some of podDefaults from user access? Like via annotation on resource?

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