Index: modules/field/field.attach.inc
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- modules/field/field.attach.inc	(revision )
+++ modules/field/field.attach.inc	(revision )
@@ -449,6 +449,7 @@
     }
   }

+  $instances = array_filter($instances);
   return $instances;
 }