Doing no mappings at all will result in validation success

[matentzn]

Minor, just so its documented. But users could, in principle, submit an entirely unmapped data dictionary. Maybe thats fine, its definitely not a priority.

[beckyjackson]

I don't think an unmapped dictionary should ever pass validation. That said, it may turn out that a cohort has a few unmapped terms that don't fit the GECKO model and that's OK... although in this case, we should encourage them to submit their unmapped terms to GECKO and see if we can fit them in.

Maybe we should require a certain percentage of the data dictionary to be mapped in order to submit? 50%?