fixed issue 1132, unicode in IS_IN_DB validator

VERSION

@@ -1 +1 @@
-Version 2.2.1 (2012-11-01 21:01:40) stable
+Version 2.2.1 (2012-11-01 21:07:42) stable

gluon/validators.py

@@ -575,6 +575,9 @@ class IS_NOT_IN_DB(Validator):
         self.record_id = id
 
     def __call__(self, value):
+        if isinstance(value,unicode):
+            value = value.encode('utf8')
+        else:
             value = str(value)
         if not value.strip():
             return (value, translate(self.error_message))