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Backport PR#7567: Fix undefined error when checkpoints is empty (#7568)

Co-authored-by: J. David Ibáñez <jdavid.ibp@gmail.com>

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Original file line number	Diff line number	Diff line change
`@@ -124,7 +124,7 @@ const checkpoints: JupyterFrontEndPlugin<void> = {`
`124`	`124`	`context?.fileChanged.connect(onChange);`
`125`	`125`
`126`	`126`	`constcheckpoints=awaitcontext?.listCheckpoints();`
`127`		`-if(!checkpoints){`
	`127`	`+if(!checkpoints\|\|!checkpoints.length){`
`128`	`128`	`return;`
`129`	`129`	`}`
`130`	`130`	`constcheckpoint=checkpoints[checkpoints.length-1];`

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