Hi In the admin, when I'm checking a particular order that has assembly products I'm getting: `undefined method `variant_options' for #<ActionView::Base:0x000000000302c8>` This line is in: [/app/views/spree/admin/orders/_assemblies.html.erb:25](https://github.com/spree-contrib/spree-product-assembly/blob/97fc6575a0e4e382d0a66c98f5c2847f98318fc0/app/views/spree/admin/orders/_assemblies.html.erb#L25). I can't find where is that method defined. What am I missing? Thanks