[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

dbbackup/management/commands/dbbackup.py

@@ -80,7 +80,9 @@ def handle(self, **options):
         self.storage = get_storage()
 
         self.database = options.get("database") or ""
-        database_keys = self.database.split(",") if self.database else settings.DATABASES
+        database_keys = (
+            self.database.split(",") if self.database else settings.DATABASES
+        )
 
         for database_key in database_keys:
             self.connector = get_connector(database_key)