adding metadata

Author: brown9804

.github/workflows/validate_and_fix_notebook.yml

@@ -36,8 +36,11 @@ jobs:
               with open(file, 'r') as f:
                   nb = nbformat.read(f, as_version=4)
               nbformat.validate(nb)
-              if 'application/vnd.jupyter.widget-state+json' not in nb.metadata.get('widgets', {}):
-                  nb.metadata['widgets'] = {'application/vnd.jupyter.widget-state+json': {'version': '1.0'}}
+              if 'widgets' in nb.metadata:
+                  if 'application/vnd.jupyter.widget-state+json' not in nb.metadata['widgets']:
+                      nb.metadata['widgets']['application/vnd.jupyter.widget-state+json'] = {'version': '1.0', 'state': {}}
+                  elif 'state' not in nb.metadata['widgets']['application/vnd.jupyter.widget-state+json']:
+                      nb.metadata['widgets']['application/vnd.jupyter.widget-state+json']['state'] = {}
               with open(file, 'w') as f:
                   nbformat.write(nb, f)
           "