OBJExporter crashes if a mapper has no input
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
Lines 162-163 of vtkOBJExporter.cxx are: ds = anActor->GetMapper()->GetInput(); ds->Update();
If a mapper has no input, this can cause a core dump when Update is performed on NULL.
Perhaps this should check for null and emit a warning rather than crash.