Fix checksum error in cats_vs_dogs dataset
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2022-03-28T07:10:55Z
https://github.com/huggingface/datasets/pull/4033#issuecomment-1080279543
https://api.github.com/repos/huggingface/datasets/issues/4033
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2022-03-28T07:49:38Z
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Recent PR updated the metadata JSON file of cats_vs_dogs dataset:
- #3878 

However, that new JSON file contains a None checksum.

This PR fixes it.

Fix #4032.