fix preassigment

app.py

@@ -14,7 +14,7 @@ def chat(message, history):
     f1 = lambda x: x[2]
     f2 = lambda x: x[3]
     bot_input_ids = [f(item) for item in history for f in (f1, f2)]
-    bot_input_ids = torch.cat([bot_input_ids, new_user_input_ids], dim=-1) if chat_history_ids is not None else new_user_input_ids
+    bot_input_ids = torch.cat([bot_input_ids, new_user_input_ids], dim=-1)
     # generated a response while limiting the total chat history to 1000 tokens, 
     chat_history_ids = model.generate(bot_input_ids, max_length=5000, pad_token_id=tokenizer.eos_token_id)
     print("The text is ", [text])