Viewer works on dataset landing page but not on full viewer page: UnexpectedApiError 
The viewer works on the dataset landing page; see for example: https://huggingface.co/datasets/hyperdemocracy/us-congress-bills
![Screenshot from 2023-09-11 09-58-10](https://github.com/huggingface/datasets-server/assets/8515462/f4cdbeb8-0695-4542-8a1f-e46a3830330c)

However it raises `UnexpectedApiError ` on the full viewer page; see: https://huggingface.co/datasets/hyperdemocracy/us-congress-bills/viewer/default/train
![Screenshot from 2023-09-11 10-00-22](https://github.com/huggingface/datasets-server/assets/8515462/1740af52-bfd2-427e-b5b9-549132d3e8c0)

Fix Hub issue: https://huggingface.co/datasets/hyperdemocracy/us-congress-bills/discussions/1

CC: @galtay @lhoestq 
Viewer works on dataset landing page but not on full viewer page: UnexpectedApiError : The viewer works on the dataset landing page; see for example: https://huggingface.co/datasets/hyperdemocracy/us-congress-bills
![Screenshot from 2023-09-11 09-58-10](https://github.com/huggingface/datasets-server/assets/8515462/f4cdbeb8-0695-4542-8a1f-e46a3830330c)

However it raises `UnexpectedApiError ` on the full viewer page; see: https://huggingface.co/datasets/hyperdemocracy/us-congress-bills/viewer/default/train
![Screenshot from 2023-09-11 10-00-22](https://github.com/huggingface/datasets-server/assets/8515462/1740af52-bfd2-427e-b5b9-549132d3e8c0)

Fix Hub issue: https://huggingface.co/datasets/hyperdemocracy/us-congress-bills/discussions/1

CC: @galtay @lhoestq 