improve code coverage for beta release

There are a couple outliers that Avijit would like us to improve.

- [ ] [dataclasses/validatation.py](https://app.codecov.io/gh/NREL/BuildingMOTIF/blob/main/buildingmotif/dataclasses)
- [ ] [utils.py](https://app.codecov.io/gh/NREL/BuildingMOTIF/tree/main/buildingmotif)