Index: fivestar_field.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/fivestar/fivestar_field.inc,v
retrieving revision 1.3.2.9
diff -u -r1.3.2.9 fivestar_field.inc
--- fivestar_field.inc	1 Jul 2008 04:42:07 -0000	1.3.2.9
+++ fivestar_field.inc	23 Jul 2008 15:53:02 -0000
@@ -151,7 +151,17 @@
       break;
   }
 }
-      
+
+/**
+ * Implementation of hook_content_is_empty().
+ */
+function fivestar_content_is_empty($item, $field) {
+  if (empty($item['rating'])) {
+    return TRUE;
+  }
+  return FALSE;
+}
+
 /**
  * Implementation of hook_widget_info().
  */