Hi Steve Klett,
If this is the case, then you can set the success path in your import lookup.
Ex: let say from the lookup import for success, you got results as: {results [{id: "123"}]. and for empty response you got as {results : []}.
Now all you need to do is set the success path as "results[0].id", now always it will check for the path present or not from the response, otherwise, it will give you an error.
you can find the success path in the import lookup --> Non-standard API respose --> Success path. Add the success path here, you no need to set the success value. all we are required to check the id present in a zeroth index or not.
Hope this helps you.