Copy results -> undefined result is empty

Hi @nunogit ,

When I copy the results column, the unmapped IDs (given in results column as "undefined" turn into a blank object.... Why is that? Perhaps we should replace it with NAN? And then if you add these results again in Goliath, skip everything that is called NAN?

Reproduce copying the results column when an unmapped ID is represented as "undefined", then trace where that value becomes a blank object. Review the handling of copied results and re-added results in Goliath. Done when the intended representation and behavior for unmapped IDs are defined and the observed blank-object behavior is addressed.

Written by the indexing model from the issue text.