Fix truncated words list when the replacement character is decoded #1089
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The current version of method
split_tokens_on_unicode
keeps aggregating tokens while the decoded sequence contains the replacement character �.However, the model can sometimes produce invalid sequences which would be decoded to the replacement character (for example in the temperature fallback). In this case we should include the replacement character in the list of words.
In this PR I propose to save the replacement character if it appears at the same position in the fully decoded sequence.