Fix wrongly converted assert
CONTRIBUTOR
Closes #3327 
2021-11-26T16:28:11Z
https://github.com/huggingface/datasets/pull/3323#issuecomment-980105707
https://api.github.com/repos/huggingface/datasets/issues/3323
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2021-11-26T16:31:28Z
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Seems like this assertion was replaced by an exception but the condition got wrongly converted.