[fix] Avoid ShallowCopy from null warning.
[fix] Avoid ShallowCopy from null warning.

If we try to update the main spreadsheet view manually, the vtkTable
output of the planeFitter filter appear to be still null. So we let the
pipeline to be updated automatically.

Kitware/VeloView,Kitware/VeloView,Kitware/VeloView,Kitware/VeloView,Kitware/VeloView