BUG #14086: Fix vtkImageAppend when no active scalars are present.
vtkImageAppend failed when the image data didn't have any point-arrays marked as scalars. Though vtkImageAppend's execution handled that case correctly, the initialization did not. This patch fixes the initialization code. Change-Id: I9207646b13038a96a26051fc3aed6d554a55aaf3
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