Dataset viewer doesn't work if split != "train"

🤗Datasets
8

DatasetViewer GUI doesn’t seem to work unless a train split exists (even a dummy one). This should make it work. Also, if list don’t work in Features, try using sequence.

  splits:
    - name: train
      num_examples: 2990
      num_bytes: 6633552671
    - name: test
      num_examples: 2990
      num_bytes: 6633552671
  configs:
    - config_name: default
      data_files:
        - split: train
          path: data_chunk_*.parquet
        - split: test
          path: data_chunk_*.parquet