Fix formatting errors

tests/test_user_error_handler.py

@@ -37,7 +37,6 @@ def test_error_handler_subclass():
     def registered_test():
         raise ChildExceptionRegistered()
 
-
     c = app.test_client()
 
     assert c.get('/parent').data == b'parent'
@@ -76,7 +75,6 @@ def test_error_handler_http_subclass():
     def unregistered_test():
         raise ForbiddenSubclassUnregistered()
 
-
     c = app.test_client()
 
     assert c.get('/forbidden').data == b'forbidden'