Providing a Default Value if No Terms Found [dfrpswc][datafeedr]

mycode_import_gender_attribute-2.php

<?php

/**
 * Add the product's gender as an attribute.
 *
 * The attribute 'Gender' with a slug of 'gender' must already exist here: WordPress Admin Area > Products > Attributes
 *
 * @param array|string $value The current value of the $attribute for this $post.
 * @param string $attribute The slug of the attribute. Examples: pa_color or pa_shoe-size
 * @param array $post An array of post data including ID, post_title, post_status, etc...
 * @param array $product An array of product data returned from the Datafeedr API.
 * @param array $set A post array for this Product Set with an array key of postmeta containing all post meta data.
 * @param string $action The action the Product Set is performing. Value are either 'insert' or 'update'.
 *
 * @return array|string The updated attribute's value.
 */
add_filter( 'dfrpswc_filter_attribute_value', function ( $value, $attribute, $post, $product, $set, $action ) {

	$ai = new Dfrpswc_Attribute_Importer( 'gender', $value, $attribute, $product );

	$ai->add_field( [ 'gender' ], 'gender', 'Unisex' );

	$ai->add_term( 'Womens', [ 'female', 'womens', 'woman', 'women' ] );
	$ai->add_term( 'Mens', [ 'male', 'mens', 'man', 'men' ] );

	return $ai->result();

}, 20, 6 );