diff --git a/app/models/metadata_boolean.rb b/app/models/metadata_boolean.rb
index 5e4b456..53a763f 100644
--- a/app/models/metadata_boolean.rb
+++ b/app/models/metadata_boolean.rb
@@ -31,6 +31,11 @@ class MetadataBoolean < MetadataTemplate
     self[:value] = true_values.include? self[:value]
   end
 
+  # Siempre guardar el valor de este campo a menos que sea nulo
+  def empty?
+    !value.nil?
+  end
+
   private
 
   # Los valores que evalúan a verdadero