Disable auto remove empty meta fields on listings when using WP Job Manager Field Editor

functions.php

<?php
// Remove the line below if you want to keep this handling on the frontend
add_filter( 'field_editor_save_custom_fields_remove_empty_value_fields', '__return_false' );

// Remove the line below if you want to keep this handling in the admin area
add_filter( 'field_editor_save_admin_custom_fields_remove_empty_value_fields', '__return_false' );