Repare vtkCutter for all data object types.

vtkCutter was no longer able to handle all kind of inputs because of
a faulty else if.

Change-Id: I31768e0df1fd1edf0e54ef55d3a066ad41c86684
Merge topic 'vtkCutter-all-dataObjectType' into master

7c6da061 Repare vtkCutter for all data object types.