[Mod] make flake8 happy

vnpy/trader/database/database_sql.py

@@ -56,7 +56,6 @@ def init_postgresql(settings: dict):
 
 
 class ModelBase(Model):
-
     def to_dict(self):
         return self.__data__
 
@@ -318,7 +317,6 @@ def init_models(db: Database, driver: Driver):
 
 
 class SqlManager(BaseDatabaseManager):
-
     def __init__(self, class_bar: Type[Model], class_tick: Type[Model]):
         self.class_bar = class_bar
         self.class_tick = class_tick
@@ -358,6 +356,7 @@ class SqlManager(BaseDatabaseManager):
             )
             .order_by(self.class_tick.datetime)
         )
+
         data = [db_tick.to_tick() for db_tick in s]
         return data