example notebook docs/jupyter/visualization/visualization.ipynb get AttributeError: 'NoneType' object has no attribute 'point_show_normal'

[huidiwiwi]

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• [X] I have searched for similar issues.
• [X] For Python issues, I have tested with the latest development wheel.
• [X] I have checked the release documentation and the latest documentation (for master branch).

My Question

I try to visualize the point cloud in jupyter notebook, but the example notebook report error : open3d_tutorial.py in jupyter_draw_geometries(geoms, window_name, width, height, left, top, point_show_normal, mesh_show_wireframe, mesh_show_back_face, lookat, up, front, zoom) 58 visible=True, # If false, capture_screen_float_buffer() won't work. 59 ) ---> 60 vis.get_render_option().point_show_normal = point_show_normal 61 vis.get_render_option().mesh_show_wireframe = mesh_show_wireframe 62 vis.get_render_option().mesh_show_back_face = mesh_show_back_face

AttributeError: 'NoneType' object has no attribute 'point_show_normal'

thanks very much!