No previous version showed

[Betristor]

Describe the bug No previous version showed.

To Reproduce Steps to reproduce the behavior:

1. Create a new notebook
2. Run some code
3. Click the auto version button
4. See error

Expected behavior Previous versions are shown.

Screenshots

Desktop (please complete the following information):

• OS: Ubuntu 20.04
• Browser: Chrome
• Version:
• jupyter: 1.0.0
• jupyterlab: 3.4.0
• jupyterlab_autoversion: 0.3.6
• nbconvert: 0.6.5

Additional context

Traceback (most recent call last):
       File "/opt/tljh/user/lib/python3.9/site-packages/tornado/web.py", line 1702, i>
         result = method(*self.path_args, **self.path_kwargs)
       File "/opt/tljh/user/lib/python3.9/site-packages/tornado/web.py", line 3173, i>
         return method(self, *args, **kwargs)
       File "/home/jupyter-zyh/.local/lib/python3.9/site-packages/jupyterlab_autovers>
         version = int(self.get_argument("version", 0))
     ValueError: invalid literal for int() with base 10: 'undefined'

[timkpaine]

@Betristor did you save the notebook before you clicked the button to restore an old version? Working fine for me on a fresh jupyterlab 3.4.0 / autoversion 0.3.6 install.

[Betristor]

Yep, after I saved the file, a version showed in the panel.