BUG: Fix errors for model slice display manager when not in slice plane

Closed Sunderlandkyl requested to merge github/fork/Sunderlandkyl/model_slice_no_input into master
  • If there is no input or if the input has no points, the vtkTransformPolyDataFilter will display an error message on every update: "No input data".
  • To prevent the error, if the input is empty then the actor should not be visible since there is nothing to display.

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