Loading related items (item_data and item_links) "eagerly".
Checking if map is defined before parsing it.
Removed unnecessary update_map method.
Replaced get_item_data method with get().to_dict().
Checking if item exists in item_data API endpoint.
Checking if item exists before converting it to dictionary in get_renderable().
Returning empty dictionary if map is not defined in Item like it was done before.