Fix METEOR missing NLTK's omw-1.4
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I also modified the doctest call to raise the exception that doctest may catch, instead of `doctest.UnexpectedException`.
This will make debugging easier if it happens again
2021-12-21T14:28:35Z
https://github.com/huggingface/datasets/pull/3469#issuecomment-998824059
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2021-12-21T14:28:35Z
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NLTK 3.6.6 now requires `omw-1.4` to be downloaded for METEOR to work.
This should fix the CI on master