🩹 Fix crash on bot load when it has no groups

apps/builder/src/features/graph/components/Graph.tsx

@@ -54,7 +54,9 @@ export const Graph = ({
   } = useGraph()
   const { updateGroupCoordinates } = useGroupsCoordinates()
   const [graphPosition, setGraphPosition] = useState(
-    graphPositionDefaultValue(typebot.groups[0]?.graphCoordinates)
+    graphPositionDefaultValue(
+      typebot.groups.at(0)?.graphCoordinates ?? { x: 0, y: 0 }
+    )
   )
   const [debouncedGraphPosition] = useDebounce(graphPosition, 200)
   const transform = useMemo(