fix assignment issue

app.py

@@ -26,7 +26,7 @@ def chat(message, history=[]):
         last_set_of_ids = history[len(history)-1][3]
         bot_input_ids = torch.cat([last_set_of_ids, new_user_input_ids], dim=-1) 
     else:
-        new_user_input_ids
+        bot_input_ids = new_user_input_ids
     response_ids = model.generate(bot_input_ids, max_length=500, pad_token_id=tokenizer.eos_token_id).tolist()
     response = tokenizer.decode(response_ids).replace("<|endoftext|>", "")
     bot_input_ids = torch.cat([last_set_of_ids, response_ids], dim=-1)