Reduce emphasis on models without any data

[jayvdb]

It is not uncommon to have apps installed with no data in any of its models. It may be unused features, or it could be abstract models, etc.

Maybe empty models can be reduced in size, and given a different color, and/or pushed to the outside of the graph where possible.

A toggle might be necessary to activate this feature, to avoid hitting every single model with a query, but maybe it is possible to start with emphasis given to models that already have a cached status of being non-empty.