Refactored ConvNet2 - ConvLayer

Dear fastai fellows,

I am looking at notebook for lesson7-cifar10 under Refactored ConvNet, when you look at Summary you see :

OrderedDict([(‘Conv2d-1’,
OrderedDict([(‘input_shape’, [-1, 3, 32, 32]),
(‘output_shape’, [-1, 20, 16, 16]),
(‘trainable’, True),
(‘nb_params’, 560)])),
('ConvLayer-2’,
** OrderedDict([(‘input_shape’, [-1, 3, 32, 32]),**
** (‘output_shape’, [-1, 20, 16, 16]),**
** (‘nb_params’, 0)])),**

I wonder what ConveLayer-2 refers to and why we essentially have it if it has zero parameters(nb_params ,0).

Cheers!
Shahin