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BUG #15438: Handle NaN when computing array range.

Utkarsh Ayachit requested to merge utkarsh.ayachit/vtk:15438_fix_nan_range into master

A small tweak to the vtkDataArrayPrivate makes it possible for us to handle NaN in arrays when computing ranges. We should not include NaN when computing the range. By ensuring that the "left" argument to the min/max functions is never a NaN, we are assured that they min/max calls won't return a NaN.

Also added a test for the same.

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