check empty field and if so, set default value for textarea field

Hello, I’m using contact form 7 with cf7-zendesk to create a ticket from the contact form.

It seems like description field from zendesk must be required not empty. However, I want my user (customer) can omit the description becuase I’m passing other fields (question type dropdown and etc)

I know I can do that by forcing the user to put some text values in the description but I don’t want to because it will make my user experience bad

Is there a way I can do that by configuring in cf7-zendesk plugin? (I’m using pro version)

I even tried to hijack by installing my custom plugin with below code but i got fatal error when i tried to activate it

<?php

/*

Plugin Name: MWS form default description

Description: never leave empty description field in contact form 7

Version: 1.0

Author: Johnny Ilmo Koo at Kooslab

*/

function set_default_description($contact_form) {

$submission = WPCF7_Submission::get_instance();

if ($submission) {

$data = $submission->get_posted_data();

if (empty($data['your-message'])) {

$data['your-message'] = 'no detailed description';

// Update the posted data with the default description

$submission->set_posted_data($data);

}

}

}

/* Before sending contact form using contact form 7 plugin,

* if description field is empty, set default value because zendesk requires it*/

add_action('wpcf7_before_send_mail', 'set_default_description');