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Histogram zero values #553

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@apasarkar

One bug in histogram widget right now:

Whenever we display data with constant value (say, something that is all zeros or all ones), the histogram computations throw a divide by zero error.

Concretely:
data = np.zeros((20, 10, 5))
iw = ImageWidget(data)
iw.show()

will throw an error.

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