Fix mypy error: add null check for Optional[list[Image]] before indexing

Co-authored-by: kristapratico <[email protected]>

Author: Copilot

sdk/openai/azure-openai/samples/images_aoai_quickstart.py

@@ -62,16 +62,17 @@ def images_aoai_quickstart() -> None:
     image_path = os.path.join(image_dir, 'generated_image.png')
 
     # Retrieve the generated image
-    image_url = result.data[0].url  # extract image URL from response
-    if image_url:
-        generated_image = httpx.get(image_url).content  # download the image
+    if result.data and len(result.data) > 0:
+        image_url = result.data[0].url  # extract image URL from response
+        if image_url:
+            generated_image = httpx.get(image_url).content  # download the image
 
-        with open(image_path, "wb") as image_file:
-            image_file.write(generated_image)
+            with open(image_path, "wb") as image_file:
+                image_file.write(generated_image)
 
-        # Display the image in the default image viewer
-        image = Image.open(image_path)
-        image.show()
+            # Display the image in the default image viewer
+            image = Image.open(image_path)
+            image.show()
 
 if __name__ == "__main__":
     images_aoai_quickstart()