New Plugin feature

We are using your plugin. Thanks for your work! It works great, but there is one caveat that looks counterintuitive. When you try to submit a form in which all fields are empty, the script sends a POST request and then receives a response. Although, in fact, already at this stage, you can display a message that some required fields are empty and not make an extra request, which takes time.

I was making a solution for plugin version 5.1.1 (making changes to contact-form-7\includes\js\scripts.js file). But it gets harder and harder to make changes every time the plugin is updated. I can provide my solution for version 5.1.1, just to speed up the appearance of this improvement in the plugin. Although you may find it feature unnecessary.