Hide empty option from filter menu

I’d tried to put the following filter (from your documention) to functions.php of my child theme, but the Empty / Not Empty in the pull downs filters are still showing.

/**
 * Hide empty option from filter menu
 *
 * @param array     $args
 * @param AC_Column $column
 *
 * @return array
 */
function my_ac_filter_menu_remove_empty_options( $args, $column ) {

	$column_type = 'column-meta';

	if ( $column_type === $column->get_type() ) {

		if ( isset( $args['empty_option'] ) ) {
			unset( $args['empty_option'] );
		}
	}

	return $args;
}

add_filter( 'acp/filtering/dropdown_args', 'my_ac_filter_menu_remove_empty_options', 10, 2 );

Any suggestions what I fail to see I’m missing here?