Add coverage to _configure_main_llm_streaming()

Author: tgasser-nv

tests/rails/llm/test_config.py

@@ -307,7 +307,6 @@ def test_rails_config_none_config_path():
     result2 = config3 + config4
     assert result2.config_path == ""
 
-
 def test_llm_rails_configure_streaming_with_attr():
     """Check LLM has the streaming attribute set if RailsConfig has it"""