fix default value

diff --git a/ipf/form/field/choice.php b/ipf/form/field/choice.php
index 368caf069e617dd43131dd90512d2eee2bcb8912..10457e10fe35a2ec132e37570b4caf8ea663cb9f 100644 (file)
--- a/ipf/form/field/choice.php
+++ b/ipf/form/field/choice.php
@@ -9,7 +9,7 @@ class IPF_Form_Field_Choice extends IPF_Form_Field
     {
         parent::clean($value);
         if (in_array($value, $this->empty_values)) {
-            return '';
+            return null;
         }
         if (!$this->validValue($value))
             throw new IPF_Exception_Form(__('Invalid choice'));