Product Feed variant images no longer fall back to product image

As of API version 2024-07, the variant image field in the product_feed/incremental_sync and product_feed/full_sync webhooks will no longer fall back to the product's first image when an image has not been explicitly set for the variant. Instead, no image will be returned.

If this change is undesirable for your use case, you can replicate the old behavior by assigning the first product image to the variant when it is null after receiving the webhook.