Update assistants.py

assistants.py

@@ -174,7 +174,7 @@ def execute_tool_calls(run_steps):
                 func_name = ""
                 
                 if hasattr(tool_call, "function"):
-                    if tool_call.output == None:
+                    if tool_call.function.output == None:
                         func_name = tool_call.function.name
                         tool_call_ids.append(tool_call.id)
                         tool_call_results.append(execute_tool_call(tool_call))