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
* FEATURE: Return subcategories on categories endpoint When using the API subcategories will now be returned nested inside of each category response under the `subcategory_list` param. We already return all the subcategory ids under the `subcategory_ids` param, but you then would have to make multiple separate API calls to fetch each of those subcategories. This way you can get **ALL** of the categories along with their subcategories in a single API response. The UI will not be affected by this change because you need to pass in the `include_subcategories=true` param in order for subcategories to be returned. In a follow up PR I'll add the API scoping for fetching categories so that a readonly API key can be used for the `/categories.json` endpoint. This endpoint should be used instead of the `/site.json` endpoint for fetching a sites categories and subcategories. * Update PR based on feedback - Have spec check for specific subcategory - Move comparison check out of loop - Only populate subcategory list if option present - Remove empty array initialization - Update api spec to allow null response * More PR updates based on feedback - Use a category serializer for the subcategory_list - Don't include the subcategory_list param if empty - For the spec check for the subcategory by id - Fix spec to account for param not present when empty