ui-charts: fix useManchetteWithSpaceTimeChart() errors with zero waypoints#11571

emersion merged 2 commits intodevOpenRailAssociation/osrd:devfrom

emr/use-manchette-with-space-time-chart-empty-waypointsOpenRailAssociation/osrd:emr/use-manchette-with-space-time-chart-empty-waypointsCopy head branch name to clipboard