Index: webform_components.inc
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/webform/webform_components.inc,v
retrieving revision 1.9.2.27
diff -u -r1.9.2.27 webform_components.inc
--- webform_components.inc	11 Jan 2009 08:08:24 -0000	1.9.2.27
+++ webform_components.inc	14 Feb 2009 19:53:59 -0000
@@ -431,7 +431,7 @@
   // Remove empty extra values.
   if (isset($form_state['values']['extra'])) {
     foreach ($form_state['values']['extra'] as $key => $value) {
-      if (empty($value)) {
+      if ($value  === '') {
         unset($form_state['values']['extra'][$key]);
       }
     }
@@ -440,7 +440,7 @@
   // Remove empty attribute values.
   if (isset($form_state['values']['extra']['attributes'])) {
     foreach ($form_state['values']['extra']['attributes'] as $key => $value) {
-      if (empty($value)) {
+      if ($value === '') {
         unset($form_state['values']['extra']['attributes'][$key]);
       }
     }