Feat/fix palyground bug

src/memos/multi_mem_cube/single_cube.py

@@ -437,7 +437,9 @@ def _fast_search(
             search_tool_memory=search_req.search_tool_memory,
             tool_mem_top_k=search_req.tool_mem_top_k,
             # TODO: tmp field for playground search goal parser, will be removed later
-            playground_search_goal_parser=search_req.playground_search_goal_parser,
+            playground_search_goal_parser=search_req.playground_search_goal_parser
+            if hasattr(search_req, "playground_search_goal_parser")
+            else False,
         )
 
         formatted_memories = [format_memory_item(data) for data in search_results]