Revert "Sanity check if the point set is empty"
Revert "Sanity check if the point set is empty"

This reverts commit a3efa8e3659363e47b8241a76f39039d119d6c2c.

NifTK/MITK,NifTK/MITK,NifTK/MITK,NifTK/MITK,NifTK/MITK,NifTK/MITK