Changes to Get nft info

the response property _status/messages/items/data became nullable for the status 400

the response property _status/messages/items/data became nullable for the status 404

the response property _status/messages/items/detail became nullable for the status 400

the response property _status/messages/items/detail became nullable for the status 404

the response property account_id became nullable for the status 200

the response property created_timestamp became nullable for the status 200

the response property delegating_spender became nullable for the status 200

the response property modified_timestamp became nullable for the status 200

the response property spender became nullable for the status 200

the response property token_id became nullable for the status 200