Fix ingredients upgrader for attributes not known on essence

There might be data attributes on ingredient classes,
that do not have corosponding attributes on the
essence class.

lib/alchemy/upgrader/tasks/ingredients_migrator.rb

@@ -56,6 +56,8 @@ def self.call(element)
                   ingredient.value = content.ingredient
                 end
                 data = ingredient.class.stored_attributes.fetch(:data, []).each_with_object({}) do |attr, d|
+                  next unless essence.respond_to?(attr)
+
                   d[attr] = essence.public_send(attr)
                 end
                 ingredient.data = data

spec/dummy/config/alchemy/elements.yml

@@ -263,6 +263,7 @@
       type: Text
       default: Hello World
       settings:
+        anchor: from_value
         linkable: true
     - role: text
       type: Richtext