{AKS} set the node vm size to empty string when the cluster sku name is automatic

[xmzhao0822]

---

This checklist is used to make sure that common guidelines for a pull request are followed.

Related command

az aks create -g -n --sku automatic

General Guidelines

• Have you run azdev style <YOUR_EXT> locally? (pip install azdev required)
• Have you run python scripts/ci/test_index.py -q locally? (pip install wheel==0.30.0 required)
• My extension version conforms to the Extension version schema

For new extensions:

• My extension description/summary conforms to the Extension Summary Guidelines.

About Extension Publish

There is a pipeline to automatically build, upload and publish extension wheels.
Once your pull request is merged into main branch, a new pull request will be created to update src/index.json automatically.
You only need to update the version information in file setup.py and historical information in file HISTORY.rst in your PR but do not modify src/index.json.

[azure-client-tools-bot-prd]

️✔️Azure CLI Extensions Breaking Change Test

️✔️Non Breaking Changes

[yonzhan]

Thank you for your contribution! We will review the pull request and get back to you soon.

[github-actions]

• For more info about extension versioning, please refer to Extension version schema

[xmzhao0822]

Note: The failing check doesn't seem that due to my code change. I tested when I pulled the latest main branch and run command azdev style azext_aks_preview without any code change, it also throws some errors like this:

************* Module azext_aks_preview.aks_diagnostics
azure-cli-extensions/src/aks-preview/azext_aks_preview/aks_diagnostics.py:48:0: R0917: Too many positional arguments (10/5) (too-many-positional-arguments)
azure-cli-extensions/src/aks-preview/azext_aks_preview/aks_diagnostics.py:258:0: R0917: Too many positional arguments (9/5) (too-many-positional-arguments)
************* Module azext_aks_preview.custom
azure-cli-extensions/src/aks-preview/azext_aks_preview/custom.py:205:0: R0917: Too many positional arguments (7/5) (too-many-positional-arguments)
azure-cli-extensions/src/aks-preview/azext_aks_preview/custom.py:262:0: R0917: Too many positional arguments (19/5) (too-many-positional-arguments)

[FumingZhang]

lgtm

Queued live test to validate the change, test passed!

• test_aks_automatic_sku