update: write errors to repsonse in add_new_lake.py

server/map_handler/add_new_lake.py

@@ -130,10 +130,11 @@ def cut_map(cursor, lake_name: str, cell_size_in_km: float = 0.5) -> (int, str):
 
     except FileNotFoundError as e:
         print(f"Failed to find the map file: {e}")
-        return 404, []
+        return 404, f"Failed to find the map file: {e}"
     except Exception as e:
         print(f"Error in adding new map: {e}")
-        return 500, []
+        return 500, f"Error in adding new map: {e}"
+
 
 def create_grid(poly: Polygon, cell_width: float, cell_height: float):
     """