return 404 if an invalid combination of otm code and region

[ahinz]

Right now returns 500

[ahinz]

Deferred for now since go-rest doesn't support this

[steventlamb]

This appears not to have changed in https://github.com/ungerik/go-rest

[steventlamb]

Taking this on because we're phasing out go-rest

[ahinz]

Ah, what's up with Go Rest? Just not being maintained anymore?

[steventlamb]

The driving reason is the lack of support for status codes besides 200 and 500. More generally, we don't have the volume of endpoints to support the obfuscation of rest layer, so we experience more pain that profit.