Fix mypy error: add null check for Optional[list[Image]] in images sample

[Copilot]

Fixed mypy type checking error in sdk/openai/azure-openai/samples/images_aoai_quickstart.py where result.data was being accessed without proper null checking.

Issue

The sample code was attempting to index result.data[0] directly, but result.data has type Optional[list[Image]], which means it could be None. This caused the mypy error:

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

Solution

Added proper null and length checking before accessing the list:

# Before (unsafe):
image_url = result.data[0].url

# After (type-safe):
if result.data and len(result.data) > 0:
    image_url = result.data[0].url
    # ... rest of image processing
else:
    print("No image data received from the API.")

This change:

• Ensures type safety by checking if result.data is not None
• Verifies the list has at least one element before indexing
• Provides helpful feedback when no image data is available
• Maintains the original functionality when data is present

Fixes #8.

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