Bugfix/36 dataset extractor fails empty dataset #37
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This feels more like a hack than an actual fix, so I could use some feedback.
Previously a dataset extractor would fail if the dataset had no files because it would try to download a zip of the dataset. That part of the code is in an ELSE block that happens if the dataset has no files, so it didn't really make sense to me, so I left some of the code but return empty lists if there are no files.