Assert forcing_data is finite and forcing_fn was able to find correct sim time. Previously, we imputed NaN when forcing data did not contain a close enough time. This led to many difficult debugging sessions for Janni.

Assert forcing_data is finite and forcing_fn was able to find correct sim time. Previously, we imputed NaN when forcing data did not contain a close enough time. This led to many difficult debugging sessions for Janni. #13