[Plugin: Contact Form 7] How do I send out only the filled in input fields?

I have a contact form that has a lot of rows with empty input fields. In the e-mail template I had to make room for all of the rows and so when a visitor fills out just 5 rows, the mail that gets sent out sends the rest of the rows as empty space. How do I send out just the rows/input fields that have been filled out and not the empty space?

Thanks for the help!

http://wordpress.org/extend/plugins/contact-form-7/