WP_Widget_Media_Gallery::has_content( array $instance )

	protected function has_content( $instance ) {
		if ( ! empty( $instance['ids'] ) ) {
			$attachments = wp_parse_id_list( $instance['ids'] );
			foreach ( $attachments as $attachment ) {
				if ( 'attachment' !== get_post_type( $attachment ) ) {
					return false;
				}
			}
			return true;
		}
		return false;
	}