Mandatory Validation Setting - by: NkemIku

Hi there,
I am adding a mandatory validation setting to my survey. I have a syntax to work from, for example:
Question: {if(count(that.A01.NAOK) ==0, "Question 1 was not answered. ","")}
Relevance equation: (count(that.A01.NAOK)==0 OR count(that.A02.NAOK)==0)

The issue here is that most of the response options for my questions are coded as 0. Do you have any idea what I can substitute with 0 to be able to get that these validation setting working for my questions with 0 coded response options?

Thanks,
Nkem.