Index: webform.install
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/webform/webform.install,v
retrieving revision 1.59
diff -u -r1.59 webform.install
--- webform.install	17 Oct 2010 20:16:09 -0000	1.59
+++ webform.install	17 Oct 2010 21:04:06 -0000
@@ -446,3 +446,14 @@
     ->condition('redirect_url', '')
     ->execute();
 }
+
+
+/**
+ * Set additional_validate and additional_submit columns to allow NULL.
+ */
+function webform_update_7305() {
+  if (db_field_exists('webform', 'additional_validate')) {
+    db_change_field('webform', 'additional_validate', 'additional_validate', array('type' => 'text', 'not null' => FALSE));
+    db_change_field('webform', 'additional_submit', 'additional_submit', array('type' => 'text', 'not null' => FALSE));
+  }
+}
\ No newline at end of file