fix uploading header twice if DataFrame is empty, fixes #47#48

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22764636 wants to merge 2 commits intomaybelinot:masterfrom 22764636:empty_dataframe

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Commits on Nov 8, 2019

fix uploading header twice if DataFrame is empty, fixes maybelinot#47
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Commits on Dec 18, 2019

correct behaviour when uploading empty dataframe
22764636
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