Update assistants.py

assistants.py

@@ -165,7 +165,10 @@ def execute_tool_calls(run_steps):
         step_details = step.step_details
         print(get_json("step_details", step_details))
 
-        gr.Info(f"Step: {step_details.type}, {get_json('usage', step.usage)}", duration=30)
+        if step.usage:
+            gr.Info(f"Step: {step_details.type}, {get_json('usage', step.usage)}", duration=30)
+        else:
+            gr.Info(f"Step: {step_details.type}", duration=30)
         
         if hasattr(step_details, "tool_calls"):
             for tool_call in step_details.tool_calls: