JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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You may enable the option Hide Empty Fields in the Advanced section of the auto-responder so that the empty/hidden fields will not be displayed in the email.
Please be noted that the feature shall be working only with the default email template. If you have made any changes to the email template, all the fields will be displayed normally.
Hope this information helps!