.values called on optional dataframe

[ricsi046]

In v0.4.0 a .values called has been added here
https://github.com/georgian-io/Multimodal-Toolkit/blob/master/multimodal_transformers/data/tabular_torch_dataset.py#L45

which results in error if we pass an empty list as the categorical_cols parameter to load_data
https://github.com/georgian-io/Multimodal-Toolkit/blob/master/multimodal_transformers/data/load_data.py#L532

[akashsaravanan-georgian]

Thanks for opening this up @ricsi046! I've set up a fix for this and it should no longer be an issue in the next release!

[ricsi046]

Sounds good, thanks.