[Pro Forms] Hide empty custom fields in cart and checkout after "Add to Cart action"

When submitting a form with the “Add To Cart Action” empty custom fields are still visible in the cart and checkout. It would be nice to hide empty fields immediately, not just after the order is submitted.

So instead of not considering empty form fields in the “Add to cart action”, maybe it is an idea to combine multiple form fields into one field. Something like the calculation field but with inputs like text, radio, checkbox etc.