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finetjul authored
vtkMRMLSceneViewNode are hidden from Editors by default; keep this behavior consistent across all vtkMRMLSceneViewNodes but make the tree widget display hidden view nodes by default. Fix crashes when the image data is not set. git-svn-id: http://svn.slicer.org/Slicer4/trunk@15643 3bd1e089-480b-0410-8dfb-8563597acbee
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