commit 15d3879669e86e74a2c8decb70028299cb230a77
Author: gnuget <gnuget@992990.no-reply.drupal.org>
Date:   Tue Apr 30 17:49:29 2013 -0500

    1898434-59

diff --git a/core/modules/options/options.api.php b/core/modules/options/options.api.php
index 0cba438..43c4d21 100644
--- a/core/modules/options/options.api.php
+++ b/core/modules/options/options.api.php
@@ -94,7 +94,7 @@ function hook_options_list($field, $instance, $entity) {
  */
 function hook_options_list_alter(&$options, $context) {
   // Check if is the field where want be changed the label of the _none option
-  if ($field->id == 'field_option') {
+  if ($context['field']->id == 'field_option') {
     // Change the label of the _none option
     $options['_none'] = t('== Empty ==');
   }