implment blank? on Address presenter

To keep the same method calls that are used on the legacy invoice template. I needed to redefine blank? on the address presenter.

app/models/invoice/data_presenter/address.rb

@@ -24,6 +24,10 @@ class Invoice
         render_address([address1, address2, city, zipcode, state&.name])
       end
 
+      def blank?
+        @data.nil?
+      end
+
       private
 
       def render_address(address_parts)