Update app.py

app.py

@@ -174,7 +174,9 @@ def list_run_steps(client, thread, run):
         step_details = step.step_details
         show_json("step_details", step_details)
 
-        # TODO: execute_tool_call
+        if not step.tool_calls:
+            break
+        
         for tool_call in step.tool_calls:
             result = execute_tool_call(tool_call)