code: def test_completion_with_empty_model():
      # test on empty
      try:
          response = completion(model=model_val, messages=messages)
      except Exception as e:
          print(f"error occurred: {e}")
          pass
  
file_path: litellm/litellm/tests/test_bad_params.py
imports: import sys, os
  import traceback
  import pytest
  import litellm
  from litellm import embedding, completion
  from litellm.utils import Message
label_desc: Use image node_id 2 for calling a global function with example usage: test_completion_with_empty_model() without return types