Changes to Get All Margin Assets (MARKET_DATA)

added the new required query request parameter asset

the response property code became required for the status 400

the response property items/assetFullName became required for the status 200

the response property items/assetName became required for the status 200

the response property items/isBorrowable became required for the status 200

the response property items/isMortgageable became required for the status 200

the response property items/userMinBorrow became required for the status 200

the response property items/userMinRepay became required for the status 200

the response property msg became required for the status 400