Added empty recipe

Necessary to build an empty recipe (handy when needing to leverage the Null Object Pattern).

Milestone: minor

lib/trmnl/api/models/recipe.rb

@@ -5,6 +5,8 @@ module TRMNL
     module Models
       # Models the payload of the API response.
       Recipe = ::Data.define :data, :meta do
+        def self.empty(meta: Recipes::Meta.new) = new(data: [], meta:)
+
         def self.for(**attributes)
           meta = attributes.slice :from,
                                   :to,

spec/lib/trmnl/api/models/recipe_spec.rb

@@ -18,6 +18,14 @@ RSpec.describe TRMNL::API::Models::Recipe do
     }
   end
 
+  describe ".empty" do
+    it "answers empty record" do
+      expect(described_class.empty).to eq(
+        described_class[data: [], meta: TRMNL::API::Models::Recipes::Meta.new]
+      )
+    end
+  end
+
   describe ".for" do
     let :attributes do
       {