Fix mypy error in images_aoai_quickstart.py - add null check for result.data

[Copilot]

Summary

Fixes a mypy type checking error in samples/images_aoai_quickstart.py where result.data was being accessed without checking for None.

Problem

The mypy error occurred at line 65 with the message:

Value of type 'Optional[list[Image]]' is not indexable [index]

This happened because result.data has type Optional[list[Image]], meaning it could potentially be None, but the code was directly indexing into it:

image_url = result.data[0].url  # extract image URL from response

Solution

Added a null check before accessing the list elements:

# Before
image_url = result.data[0].url  # extract image URL from response

# After  
image_url = result.data[0].url if result.data and len(result.data) > 0 else None  # extract image URL from response

This change:

• Ensures result.data is not None and contains at least one element before indexing
• Returns None if the data is missing, which works seamlessly with the existing if image_url: check
• Preserves all existing behavior and error handling
• Resolves the mypy type checking error

Testing

• Verified mypy now passes without errors
• Confirmed the sample syntax is valid
• Ensured no regression in existing behavior

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• http://168.63.129.16:80/machine/
  • Triggering command: /usr/bin/python3 -u bin/WALinuxAgent-2.13.1.1-py3.9.egg -collect-logs (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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[github-actions]

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