BUG: fix+test quantile with empty DataFrame, closes #23925#27436

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jreback merged 11 commits intopandas-dev:masterfrom

jbrockmendel:quantile

Jul 24, 2019

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Merge branch 'master' of https://github.com/pandas-dev/pandas into quantile
jbrockmendel
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Commits on Jul 23, 2019