EU VAT Assistant - Hide VAT number when company is empty

/**
 * Aelia EU VAT Assistant for WooCommerce - Show VAT number only when the company field is populated.
 *
 * Last updated: 5 August 2019
 *
 * HOW TO USE THIS CODE
 * Simply add the code to the bottom of your theme's functions.php file, and it
 * will run automatically. For more information: https://www.skyverge.com/blog/add-custom-code-to-wordpress/
 *
 * GPL DISCLAIMER
 * Because this code program is free of charge, there is no warranty for it, to the extent permitted by applicable law.
 * Except when otherwise stated in writing the copyright holders and/or other parties provide the program "as is"
 * without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of
 * merchantability and fitness for a particular purpose. The entire risk as to the quality and performance of the program
 * is with you. should the program prove defective, you assume the cost of all necessary servicing, repair or correction.
 *
 * Need a consultation, or assistance to customise this code? Find us on Codeable: https://aelia.co/hire_us
 */

add_action('wp_footer', function() {
  ?>
  <script type="text/javascript">
    jQuery(document).ready(function($) {
      $('form.checkout, #order_review').on('change', function() {
        var company_field_empty = ($('#billing_company').val().trim() == '');

        // Check if the company field is populated. If not, hide the VAT number
        // field.
        $('.aelia_wc_eu_vat_assistant.vat_number').toggle(!company_field_empty);

        // Uncomment the code below to clear the VAT number when the company
        // name is emptied
        //if(company_field_empty) {
        //  $('#vat_number').val('');
        //}
      });
    });
  </script>
  <?php
});