Fix ignore warning

modeling_chatglm.py

@@ -1107,7 +1107,7 @@ class ChatGLMForConditionalGeneration(ChatGLMPreTrainedModel):
  )
  elif generation_config.max_new_tokens is not None:
  generation_config.max_length = generation_config.max_new_tokens + input_ids_seq_length
- if not has_default_max_length:
+ if not has_default_max_length and generation_config.max_length is not None:
  logger.warn(
  f"Both `max_new_tokens` (={generation_config.max_new_tokens}) and `max_length`(="
  f"{generation_config.max_length}) seem to have been set. `max_new_tokens` will take precedence. "