Improve how we manage the datasets without rights to be redistributed
see https://github.com/huggingface/datasets-server/issues/12 for the ManualDownloadError.

More generally, all the endpoints should manage coherent information about the datasets that are explicitly not supported by the datasets server, due to their license.
Improve how we manage the datasets without rights to be redistributed: see https://github.com/huggingface/datasets-server/issues/12 for the ManualDownloadError.

More generally, all the endpoints should manage coherent information about the datasets that are explicitly not supported by the datasets server, due to their license.