Filter cac/addon/filtering/dropdown_empty_option

Usage

/**
 * Filter empty option
 *
 * @param bool True / False
 * @param CPAC_Column $column_instance Column class instance
 */
function my_filtering_empty_option( $add_empty_option, $column ) {

	// Possibly modify $add_empty_option

	return $add_empty_option;
}
add_filter( 'cac/addon/filtering/dropdown_empty_option', 'my_filtering_empty_option', 10, 2 );

Example

/**
 * Example: Remove the "add empty" option from the dropdown for the 'Taxonomy' column type
 *
 */
function my_filtering_remove_empty_option_for_taxonomies( $add_empty_option, $column ) {
	if ( 'column-taxonomy' == $column->get_type() ) {
		$add_empty_option = false;
	}

	return $add_empty_option;
}
add_filter( 'cac/addon/filtering/dropdown_empty_option', 'my_filtering_remove_empty_option_for_taxonomies', 10, 2 );