Add

hide_empty = >0 as parameter

Eg:-

<?php
$args = array(
‘post_type’ => ‘product’, ‘posts_per_page’ => 1, ‘orderby’ => ‘rand’,’hide_empty’=> 0);
$product_categories = get_terms(‘product_cat’, $args );
foreach ( $product_categories as $product_category ) {
echo $product_category->name . “<br />”;

}
?>