indicar cuándo se vacía un select

app/views/posts/attributes/_belongs_to.haml

@@ -2,6 +2,6 @@
   = label_tag "#{base}_#{attribute}", post_label_t(attribute, post: post)
   = select_tag(plain_field_name_for(base, attribute),
     options_for_select(metadata.values, metadata.value),
-    **field_options(attribute, metadata), include_blank: true)
+    **field_options(attribute, metadata), include_blank: t('.empty'))
   = render 'posts/attribute_feedback',
     post: post, attribute: attribute, metadata: metadata

config/locales/en.yml

@@ -481,6 +481,8 @@ en:
       image:
         label: Imagen
         destroy: Remove image
+      belongs_to:
+        empty: "(Empty)"
     reorder:
       submit: 'Save order'
       select: 'Select this post'

config/locales/es.yml

@@ -490,6 +490,8 @@ es:
       image:
         label: Imagen
         destroy: 'Eliminar imagen'
+      belongs_to:
+        empty: "(Vacío)"
     reorder:
       submit: 'Guardar orden'
       select: 'Seleccionar este artículo'