Improve Jupyter workflow when configuration is broken

[datajoely]

Description

Is your feature request related to a problem? A clear and concise description of what the problem is: "I'm always frustrated when ..."

Using the spaceflights demo on 0.18.1 if I open a kedro jupyter notebook session and write catalog.list() I will get the following:

If I break the catalog.yml file so that it is unparsable and run kedro catalog list (or any other command like kedro run I will get a helpful parse error in the terminal:

However, if I start a kedro jupyter notebook session in this state, I get no warning or messaging that Kedro is unable to create the catalog, session and other global variables. As a user I get this confusing state where the catalog is no longer available to me:

Context

Why is this change important to you? How would you use it? How can it benefit other users?

I think novice users can get stuck here with no direction as to why the catalog is not available.

Possible Implementation

Surface warning to the jupyter context, perhaps even make a dummy catalog, context, session objects available that expose the log message when called...

[antonymilne]

I like this suggestion 👍 Does the error message appear in the console where you run kedro jupyter notebook or nowhere at all?

We used to have some sort of startup_error variable, not sure what happened to it. We actually need to improve error handling in load_ipython_extension in general anyway, so it probably makes sense to consider this issue at the same time as that so we have a solution that makes sense. I'll try to figure out the best way to approach these would be.

[datajoely]

I don't think so - this is what comes up in the 2nd run:

kedro jupyter notebook
2022-06-06 10:55:55,418 - kedro.framework.cli.hooks.manager - INFO - Registered CLI hooks from 1 installed plugin(s): kedro-telemetry-0.2.1
Jupyter kernel kedro_jupytertest already exists and will be used.
/Users/.../miniconda3/envs/kedro-temp/bin/python -m jupyter notebook --MultiKernelManager.default_kernel_name=kedro_jupytertest
[I 2022-06-06 10:55:59.524 LabApp] JupyterLab extension loaded from /Users/.../miniconda3/envs/kedro-temp/lib/python3.8/site-packages/jupyterlab
[I 2022-06-06 10:55:59.524 LabApp] JupyterLab application directory is /Users/.../miniconda3/envs/kedro-temp/share/jupyter/lab
[I 10:55:59.530 NotebookApp] Serving notebooks from local directory: /Users/.../Documents/projects/jupytertest
[I 10:55:59.530 NotebookApp] Jupyter Notebook 6.4.11 is running at:
[I 10:55:59.530 NotebookApp] http://localhost:8888/?token=7e16104fba399d8efa9d8700ad3e5cb9a0ce9b9bfd5e9fd1
[I 10:55:59.530 NotebookApp]  or http://127.0.0.1:8888/?token=7e16104fba399d8efa9d8700ad3e5cb9a0ce9b9bfd5e9fd1
[I 10:55:59.530 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 10:55:59.537 NotebookApp]

    To access the notebook, open this file in a browser:
        file:///Users/.../Library/Jupyter/runtime/nbserver-5978-open.html
    Or copy and paste one of these URLs:
        http://localhost:8888/?token=7e16104fba399d8efa9d8700ad3e5cb9a0ce9b9bfd5e9fd1
     or http://127.0.0.1:8888/?token=7e16104fba399d8efa9d8700ad3e5cb9a0ce9b9bfd5e9fd1
[W 10:56:01.358 NotebookApp] Kernel Provisioning: The 'local-provisioner' is not found.  This is likely due to the presence of multiple jupyter_client distributions and a previous distribution is being used as the source for entrypoints - which does not include 'local-provisioner'.  That distribution should be removed such that only the version-appropriate distribution remains (version >= 7).  Until then, a 'local-provisioner' entrypoint will be automatically constructed and used.
    The candidate distribution locations are: ['/Users/.../miniconda3/envs/kedro-temp/lib/python3.8/site-packages/jupyter_client-7.3.2.dist-info']
[I 10:56:05.564 NotebookApp] Kernel started: a2c15a7b-22ff-400d-85be-48d61a39bb74, name: kedro_jupytertest
[IPKernelApp] ERROR | No such comm target registered: jupyter.widget.control
[IPKernelApp] WARNING | No such comm: 18ba389e-4b85-471c-a2c1-c8e83a925b94
[W 10:56:18.898 NotebookApp] 404 GET /api/kernels/b3ffafb1-e8b3-404f-b08b-722f43d6bfcd/channels?session_id=4051ac1d7f0248a0b336e473cc59b596 (::1): Kernel does not exist: b3ffafb1-e8b3-404f-b08b-722f43d6bfcd
[W 10:56:18.909 NotebookApp] 404 GET /api/kernels/b3ffafb1-e8b3-404f-b08b-722f43d6bfcd/channels?session_id=4051ac1d7f0248a0b336e473cc59b596 (::1) 11.950000ms referer=None
[I 10:56:46.782 NotebookApp] Saving file at /notebooks/Untitled.ipynb
[W 10:57:23.951 NotebookApp] 404 GET /api/kernels/b3ffafb1-e8b3-404f-b08b-722f43d6bfcd/channels?session_id=4051ac1d7f0248a0b336e473cc59b596 (::1): Kernel does not exist: b3ffafb1-e8b3-404f-b08b-722f43d6bfcd
[W 10:57:23.952 NotebookApp] 404 GET /api/kernels/b3ffafb1-e8b3-404f-b08b-722f43d6bfcd/channels?session_id=4051ac1d7f0248a0b336e473cc59b596 (::1) 1.990000ms referer=None
[I 11:01:43.490 NotebookApp] Starting buffering for a2c15a7b-22ff-400d-85be-48d61a39bb74:8b65c945c8f74bd1a009a0cca76f1844