In general I understand and appreciate your statement.

I ran into an issue while updating some legacy code that indexes on country-code not the alpha-2 field.
It's easy enough to inject arbitrary values for the missing fields, and still call out the data exceptions.

Unfortunately, without standard values I'll need exceptions for other IP location tools as well.

Considered that too, but the code base is attempting to sequentially map the entire IP range. Given the ranges appear unallocated the method I use at this time is of little consequence. It's just a data anomaly.