ENH: Better error checking in VRMLImporterDemo
ENH: Better error checking in VRMLImporterDemo

lorensen/VTKExamples,lorensen/VTKExamples,lorensen/VTKExamples,lorensen/VTKExamples,lorensen/VTKExamples,lorensen/VTKExamples,lorensen/VTKExamples