Link - Nil Param

Setup

defmodule Foo do
  use(Mazurka.Resource)

  param(foo)

  mediatype(Hyper) do
    action() do
      %{}
    end
  end
end
defmodule Bar do
  use(Mazurka.Resource)

  mediatype(Hyper) do
    action() do
      %{"foo" => link_to(Foo, foo: nil)}
    end
  end
end

Bar.action

{res, _, _} = Bar.action([], %{}, %{}, %{})
%{"foo" => %Mazurka.Affordance.Undefined{resource: Foo}} = res