Check the command is registered before calling notifyCommandChanged()
#16273
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References
#16113.
Code changes
Implement the suggestion from @krassowski in #16138 (comment).
Still not sure it's the "right" fix, but maybe it can already help limit the amount of errors seen in the dev tools console when using Notebook 7.
User-facing changes
This should help fix the following errors showing up in the dev tools console when using Notebook 7:
Backwards-incompatible changes
None