fix flake8 found issues

freqtrade/freqai/normalization.py

@@ -16,8 +16,7 @@ def normalization_factory(
             config: Config,
             meta_data: Dict[str, Any],
             pickle_meta_data: Dict[str, Any],
-            unique_class_list: list
-    ):
+            unique_class_list: list):
     freqai_config: Dict[str, Any] = config["freqai"]
     norm_config_id = freqai_config["feature_parameters"].get("data_normalization", "legacy")
     if norm_config_id.lower() == "legacy":
@@ -268,5 +267,3 @@ class QuantileNormalization(SKLearnNormalization):
                  unique_class_list: list):
         super().__init__(config, meta_data, pickle_meta_data, unique_class_list,
                          QuantileTransformer)
-
-

tests/freqai/test_normalization.py

@@ -84,6 +84,7 @@ def test_assertion_invalid_normalization_id(mocker, freqai_conf):
         assert str(e_info).startswith("Invalid data normalization identifier"), \
             "unexpected exception string"
 
+
 @pytest.mark.parametrize(
     "config_id",
     [