Update openstef/feature_engineering/missing_values_transformer.py

Co-authored-by: Egor Dmitriev <egordmitriev2@gmail.com>
Signed-off-by: Lars Schilders <123180911+lschilders@users.noreply.github.com>

openstef/feature_engineering/missing_values_transformer.py

@@ -45,9 +45,7 @@ def __init__(
         self.missing_values = missing_values
         self.imputation_strategy = imputation_strategy
         self.fill_value = fill_value
-        if no_fill_future_values_features is None:
-            no_fill_future_values_features = []
-        self.no_fill_future_values_features = no_fill_future_values_features
+        self.no_fill_future_values_features = no_fill_future_values_features or []
         self.is_fitted_ = False
 
         # Build the proper imputation transformer