class_docstr: Normalizer tests
class_docstr_tok: ["Normalizer","tests"]
docstr: Normalizer - Load From Config, Empty
docstr_tok: ["Normalizer","-","Load","From","Config",",","Empty"]
code: def test_load_from_config_empty(self):
      """Normalizer - Load From Config, Empty"""
      normalizer = Normalizer.load_from_config({})
      assert_equal(normalizer, Normalizer)
      assert_equal(normalizer._types_config, None)
  
imports: from mock import Mock, patch
  from nose.tools import assert_equal, assert_false, assert_raises, assert_true
  from streamalert.shared.exceptions import ConfigError
  from streamalert.shared.normalize import Normalizer, NormalizedType
  from tests.unit.streamalert.shared.test_utils import MOCK_RECORD_ID
label_desc: Use image node_id 18 for calling the TestNormalizer obj's underlying member method code with example usage: obj.test_load_from_config_empty() without return types