dataset_description requirements

[djarecka]

I noticed that you changed the requirements that each input requires dataset_description.json file, and I'm wondering if it's really good idea to enforce it (perhaps we can have just warnings?).
And if that's the case, should we create dataset_description.json for the output as well? Right now the output of babs couldn't be used for an input

[tien-tong]

BABS is designed to take BIDS raw/derivative inputs and run BIDS apps, and both of those are expected to include a dataset_description.json for proper validation. In the current setup, the output zip will include a dataset_description.json if the BIDS app themselves generate one.

That said, it should be easy to add an option for creating a blank dataset_description.json if users request.