gform_gfcf_custom_empty_field_check

gform.addFilter('gform_gfcf_custom_empty_field_check', function() {
    // Your logic here
});

document.addEventListener('DOMContentLoaded', function() {
    // Custom function to add to the gform_gfcf_custom_empty_field_check filter.
    function customBypassValidations(bypassFunctions) {
        // The pipe field is a hidden input element and, by default, hidden elements
        // aren't counted as filled fields when checking if the form is empty.
        // Adding a filter for the pipe field will force Conversational Forms
        // to check if the field is empty or not.
        bypassFunctions.push([
            // Check if the input is of type pipe_recorder
            function(input) {
                return input.closest('.gfield--input-type-pipe_recorder');
            },
            // Set to false so internally it is not bypassed as a hidden input
            function() {
                return false;
            }
        ]);
        return bypassFunctions;
    }

    // Add filter to the gform object
    if (typeof gform !== 'undefined' && typeof gform.addFilter === 'function') {
        gform.addFilter('gform_gfcf_custom_empty_field_check', customBypassValidations);
    }
});