Allow raises-exception to continue

[blink1073]

cf jupyter/notebook#2549. Allows for code execution to continue if a tag “raises-exception” is encountered.

[mgeier]

👍 This would be a great feature, but please don't make the same mistake that notebook (jupyter/notebook#4198) and nbconvert (jupyter/nbconvert#730) made:

If an exception is raised in a cell tagged with raises-exception, the execution of the following cells should continue. So far, so obvious. However, if such a cell does not raise an exception, this should itself be an error (and probably itself raise an exception show an error dialog(?) mentioning the raises-exception tag) and stop further cells from executing.

[paugier]

"raises-exception" is really a must-have feature for pedagogical notebooks. It would really be good to be able to use this tag in jupyter-lab.

[blink1073]

Thanks for the prompt, @paugier, I'll take this one for 1.0.

[blink1073]

I am going to implement the same behavior as notebook. If it changes there, we will follow suit.

[lock]

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