Sky subtraction does not fail on an image full of NaNs. #159
Description
Thought SFFT's SEx_SkySubtract.SSS() would fail on an all-nan image, but it doesn't. Was expecting an exception. Hmm.
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Thought SFFT's SEx_SkySubtract.SSS() would fail on an all-nan image, but it doesn't. Was expecting an exception. Hmm.