Update app.py

app.py

@@ -30,6 +30,7 @@ from assistants import (
 
 def chat(message, history, openai_api_key):
     if not openai_api_key:
+        set_openai_client()
         raise gr.Error("OpenAI API Key is required (see additional inputs below).")
     if not message:
         raise gr.Error("Message is required.")