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I did test this issue in one of my test form and I am unable to replicate the issue you are having. The empty "Address" field does not gets displayed. Please check the screenshot below:
I would suggest you to test it again and get back to us if the issue persists. Also please let us know the form with which you are having this issue with. I did check your form "Modulo on-line per la richiesta aggiornamento A.I.R.E" and it seems you have not enabled the "Hide Empty Fields on Email". Please check the screenshot below:
We will wait for your response.