Kernel execution errors not being rendered in OutputArea

[sglyon]

Hello! I'm using thebe in a project and have run into a snag.

Kernel outputs are shown nicely (including widgets and multimedia) when code succeeds, however when there is a runtime error in the kernel nothing is shown.

I recorded a video clip walking through the error: https://app.screencastify.com/v3/watch/492g6QRsO1NjMOjdrg13

You can also reproduce by

1. going to the "simple" demo (here or by running the demo via the main branch of this repo)
2. Activating the kernel
3. Replacing the input of the code cell with code that would trigger a Python exception (I just put assert False)
4. Running the code

What you will see is no rendered output in the OutputArea, but you will see the traceback printed to the javascript console

What we want to see is the errors rendered in the OutputArea.

[sglyon]

Hi team, sorry to nudge here. If anyone has an idea of where I could start looking I would be happy to attempt a pull request

thanks!

[stevejpurves]

This seems like a regression as previously we have always rendered errors, will take a look @sglyon

[stevejpurves]

@sglyon fix in place, will go out on next release, hopefully tomorrow

[sglyon]

Amazing. Thank you @stevejpurves

I will test this out and hope for the best ;)

[sglyon]

Thank you @stevejpurves I just updated based on a build from main and it works great ;)