When boxes is empty, it throws an error.#7

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sitifukujin wants to merge 5 commits intoHakuyume:masterfrom sitifukujin:boxemptybugfix

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Commits on Jun 5, 2017

When boxes is empty, it throws an error.

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refactored on plint, flake8 and so on

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Commits on Jun 6, 2017

Refine only on flake8

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chage to empty(0,4)

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change to "return np.empty((0,4)), np.empty(0), np.empty(0)"

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