ENH: GH12042 Add parameter `drop_first` to get_dummies to get n-1 variables out of n levels.#12092

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Commits on Feb 1, 2016

ENH: GH12042 Add parameter `drop_first` to get_dummies to get k-1 variables out of n levels.
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Test the case that `drop_first` is on and categorical variable only has one level.
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Commits on Feb 2, 2016

Compare with empty DataFrame, not just check empty
BranYang
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