Issue with GTM tracking and displayed elements for forms

Hello,

let's take the following example:

http://www.talend.com/talend-big-data-sandbox

the embedded request form on this page has the following code

<div>Please fill out the following form to start the download and receive per email your license key.</div>

<form id="mktoForm_2608"></form>

Since there are no form elements embedded on the page, GTM can't process form tracking rules.

Now my big question is:

Is there a way to display form elements instead of empty placeholder?

Cécile

Note: apparently the issue is also happening on this page FREE Trial of Talend Big Data Sandbox  so replacing embedded form by MKTO landing page doesn't help our issue.