Since ember-data seems to expect `source/pointer` to be `"data/attributes/base"` for errors on the model which aren't specific to a model attribute (https://github.com/emberjs/data/blob/v3.5.0/addon/-private/adapters/errors.js#L446) and https://github.com/jsonapi-suite/jsonapi_errorable/pull/13/files#diff-464e7d878a98e6a985d3f83118db6c98R97 started setting `source/pointer` to `nil`. The error on returned from the api can no longer be found on the ember-data model. Why was this change made? Can it be undone or made an option?