Use of Fallback images in img()

[imClement]

Hello,

I use the following code so I can have both responsive images and custom classes in the <img construction

{{ $model->getFirstMedia()->img('default', ['class' => 'myClass anotherClass']) }}

The problem is when the model doesn't have a media in the library, I get a null value for the img to be used.

Facade\Ignition\Exceptions\ViewException
Call to a member function img() on null

I think it will be better if the img() will use the Fallback images when they are defined in the Collection