fix: Simplify loop stopping condition to prevent off-by-one errors

src/backend/base/langflow/components/logic/loop.py

@@ -54,7 +54,7 @@ def evaluate_stop_loop(self) -> bool:
         """Evaluate whether to stop item or done output."""
         current_index = self.ctx.get(f"{self._id}_index", 0)
         data_length = len(self.ctx.get(f"{self._id}_data", []))
-        return current_index > data_length
+        return current_index > max(data_length - 1, 0)
 
     def item_output(self) -> Data:
         """Output the next item in the list or stop if done."""