BUG: Remove pipeline error in VTK6 with DiffusionTensorDisplayNode

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23363 3bd1e089-480b-0410-8dfb-8563597acbee
BUG: Fix vtkImageLabelPropagation VTK 6 support

Fixes vtkSlicerCommonInterfaceTest1

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23364 3bd1e089-480b-0410-8dfb-8563597acbee