[Plugin: Custom Contact Forms] Don't list empty fields in admin/mail

I have a very long form and I would like to show in the email and in the admin only the fields that have text in them. I don’t want the empty fields to show up like this :

Product:
Quantity:
Name: whatever

From this example I would like to display only Name because it has a value != “”

Is this possible ? I can do it with JS by removing the empty fields on submit, but I want a more elegant way.

Thanks