TokenConfig does not retrieve derived attributes for non-DataModel systems

[Fyorl]

We moved to the model in #8726 for systems that use DataModels but should preserve the existing functionality for systems that don't, since it doesn't require any special toObject(false) behaviour.

[DJ4ddi]

Just to clarify, can this cause resource attributes to be read as single values instead of bars (as described in #8907)?

[aaclayton]

Yes, I believe it would have that side effect. The fix we would apply here should correct that issue, but @Fyorl can verify as part of what we merge in.