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

### Checklist

- [X] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues).
- [X] For Python issues, I have tested with the [latest development wheel](http://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [X] I have checked the [release documentation](http://www.open3d.org/docs/release/) and the [latest documentation](http://www.open3d.org/docs/latest/) (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!