Update scikit feature check for np array None
Update scikit feature check for np array None

if you pass the variable 'feature_names=None', this will break because that line turns feature_names into <class 'numpy.ndarray'> instead of <class 'NoneType'> so the 'is None' check will fail

btw I think the fix is to replace line 517 with 'if feature_names == None' as explained in this stackoverflow answer: https://stackoverflow.com/questions/54186190/why-does-numpy-ndarray-allow-for-a-none-array
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