Unwrap final_answer in Gradio_UI

There is a bug in Gradio_UI.py: line 157 calls handle_agent_output_types(final_answer), but this function does not unwrap final_answer (which can contain an AgentText, an AgentImage, an AgentAudio or another object). Since this object is never unwrapped from final_answer, the checks in lines 159 - 173 all fail. This means whatever is inside final_answer just gets output as a string (instead of an image, audio file, etc.). This fix exposes the contents of final_answer and lets Gradio handle them appropriately.

Gradio_UI.py

@@ -154,7 +154,7 @@ def stream_to_gradio(
             yield message
 
     final_answer = step_log  # Last log is the run's final_answer
-    final_answer = handle_agent_output_types(final_answer)
+    final_answer = handle_agent_output_types(final_answer.final_answer)
 
     if isinstance(final_answer, AgentText):
         yield gr.ChatMessage(