Out of band file deletion results in watch file error

[fcollonval]

Description

While running a jupyter-server, in which a document is created and modified through a room. If the document is deleted out of band, the watcher keeps throwing errors. Here is an example of the error encountered:

[E 2024-12-13 14:28:16.812 YDocExtension] Error watching file: test-c3d69e549bba475b876203b758f9c616.ipynb
    HTTPError()
    Traceback (most recent call last):
      File "/home/fcollonval/miniconda3/envs/kernel-client/lib/python3.12/site-packages/jupyter_server_ydoc/loaders.py", line 207, in _watch_file
        await self.maybe_notify()
      File "/home/fcollonval/miniconda3/envs/kernel-client/lib/python3.12/site-packages/jupyter_server_ydoc/loaders.py", line 226, in maybe_notify
        model = await ensure_async(self._contents_manager.get(path, content=False))
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/fcollonval/miniconda3/envs/kernel-client/lib/python3.12/site-packages/jupyter_core/utils/__init__.py", line 198, in ensure_async
        result = await obj
                 ^^^^^^^^^
      File "/home/fcollonval/miniconda3/envs/kernel-client/lib/python3.12/site-packages/jupyter_server/services/contents/filemanager.py", line 910, in get
        raise web.HTTPError(404, "No such file or directory: %s" % path)
    tornado.web.HTTPError: HTTP 404: Not Found (No such file or directory: test-c3d69e549bba475b876203b758f9c616.ipynb)

Reproduce

1. Start a jupyter-server
2. Open and edit a document
3. Delete the document out of band

Expected behavior

This is a tricky question, I guess we should stop watching the file and stop the room if nobody is there. If the room is still live, I guess the file will eventually be recreated.

I didn't yet analyze if the room was still there or not.

Context

jupyter_client            8.6.3
jupyter-collaboration     3.0.1
jupyter-collaboration-ui  1.0.1
jupyter_core              5.7.2
jupyter-docprovider       1.0.1
jupyter-events            0.10.0
jupyter-lsp               2.2.5
jupyter_server            2.14.2
jupyter_server_fileid     0.9.3
jupyter_server_terminals  0.5.3
jupyter-server-ydoc       1.0.1
jupyter-ydoc              3.0.2