Update app.py

app.py

@@ -121,14 +121,15 @@ def extract_content_values(data):
     return content_values
 
 def chat(message, history):
+    if not message:
+        raise gr.Error("Message is required.")
+    
     global client, assistant, thread     
-
-    print(history)
     
     if assistant == None:
         assistant = load_assistant(client)
 
-    if thread == None:
+    if len(history) == 0:
         thread = create_thread(client)
         
     create_message(client, thread, message)