nlp viewer error
{'login': 'jc-hou', 'id': 30210529, 'node_id': 'MDQ6VXNlcjMwMjEwNTI5', 'avatar_url': 'https://avatars.githubusercontent.com/u/30210529?v=4', 'gravatar_id': '', 'url': 'https://api.github.com/users/jc-hou', 'html_url': 'https://github.com/jc-hou', 'followers_url': 'https://api.github.com/users/jc-hou/followers', 'following_url': 'https://api.github.com/users/jc-hou/following{/other_user}', 'gists_url': 'https://api.github.com/users/jc-hou/gists{/gist_id}', 'starred_url': 'https://api.github.com/users/jc-hou/starred{/owner}{/repo}', 'subscriptions_url': 'https://api.github.com/users/jc-hou/subscriptions', 'organizations_url': 'https://api.github.com/users/jc-hou/orgs', 'repos_url': 'https://api.github.com/users/jc-hou/repos', 'events_url': 'https://api.github.com/users/jc-hou/events{/privacy}', 'received_events_url': 'https://api.github.com/users/jc-hou/received_events', 'type': 'User', 'site_admin': False}
[{'id': 2107841032, 'node_id': 'MDU6TGFiZWwyMTA3ODQxMDMy', 'url': 'https://api.github.com/repos/huggingface/datasets/labels/nlp-viewer', 'name': 'nlp-viewer', 'color': '94203D', 'default': False, 'description': ''}]
[]
and also for 'blog_authorship_corpus'
https://huggingface.co/nlp/viewer/?dataset=blog_authorship_corpus
![image](https://user-images.githubusercontent.com/30210529/98557329-5c182800-22a4-11eb-9b01-5b910fb8fcd4.png)
 Is this the problem of my local computer or ?? Related to:
- #673
Hello, 
when I select amazon_us_reviews in nlp viewer, it shows error.
https://huggingface.co/nlp/viewer/?dataset=amazon_us_reviews
![image](https://user-images.githubusercontent.com/30210529/98447334-4aa81200-2124-11eb-9dca-82c3ab34ccc2.png)

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