This may seem like a hack,  but I think it will work. 

Put two page includes there.  1: going to a page that just says “sorry, nothing to see here”  and 2: going to your contact detail page - and has as query string the ID of the first row of the model most predictably will have data. 

Then conditionally render the two includes. 
- Include 1 only renders if no rows are in that selected model.
- Include 2 only renders if there ARE rows in that selected model. 

I think that’ll work as well. Why didn’t I think of that.

This worked.