A warning about NaN imputation was written in case ElementProperty was initialiazed with impute_nan=False, even though the data source could be itself initialized with impute_nan=True. The warning is removed, since the imputation is only happening at the level of the data source.
I missed an imputation in WenAlloys featurizer.
I'm make some tests now to decide whether the default of impute_nan should be switched to True.
Summary
This fixes 2 small things:
I'm make some tests now to decide whether the default of impute_nan should be switched to True.