Ok, I think I'm getting closer....
Attached is a screenshot of what I've done.
The thing that doesn't make sense to me is where it says: if the total number of items where 'MyColumn' has a value of 'MyValue' is '>=' to a value of '0'. What I need is simply: if the total number of items where 'MyColumn' has a value that is '>=' to a value of '0'.