Tutorial notebook is not rendering on github.com

[rgiordan]

The tutorial notebook fails to render when you navigate to it in github on a browser. The error text is

Invalid Notebook
There was an error rendering your Notebook: the 'state' key is missing from 'metadata.widgets'. 
Add 'state' to each, or remove 'metadata.widgets'.
Using nbformat v5.10.4 and nbconvert v7.16.6