Recording No Response as "No Response" in Data Output

OS X El Capitan (Mac)
PsychoPy version 1.85.1

In my csv data output, I want to have no response (i.e. no key pressed) be recorded as “no response” (not a 1 or a 0). I have other keys that are pressed and recorded as wrong or right based on my answer key, but I don’t want no response at all to be recorded as wrong or right. I can’t find anywhere on builder view for how to do this, so I was thinking I could get some advice on a snippet of code that might help PsychoPy record the responses in the way that I want.

Thank you!
Alexandra