notification-hub: tolerate missing gcmCredential in gcm update output

[a0x1ab]

• Fixes az notification-hub credential gcm update to not fail when the service response omits properties.gcmCredential.
• Replaces strict output selection with a tolerant selector (get()), returning {} when the credential block is absent.
• Prevents false ResourceNotFoundError

---

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az notification-hub

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[azure-client-tools-bot-prd]

️✔️Azure CLI Extensions Breaking Change Test

️✔️Non Breaking Changes

[azure-client-tools-bot-prd]

Hi @a0x1ab,
Please write the description of changes which can be perceived by customers into HISTORY.rst.
If you want to release a new extension version, please update the version in setup.py as well.

[yonzhan]

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

[github-actions]

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[github-actions]

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[github-actions]

Hi @a0x1ab

Release Suggestions

Module: notification-hub

• Please log updates into to src/notification-hub/HISTORY.rst
• Update VERSION to 2.0.0b2 in src/notification-hub/setup.py

Notes

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

[Copilot]

Pull request overview

This PR fixes the az notification-hub credential gcm update command to handle cases where the Azure service response omits the properties.gcmCredential field, preventing false ResourceNotFoundError exceptions.

Key Changes:

• Replaced strict selector method required() with tolerant get() method
• Added null/undefined check with empty dictionary fallback to gracefully handle missing credentials