Fixed #3293 -- newforms: Changed IntegerField.clean() to return None if field is not required and empty. Thanks, Honza Kral

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4312 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/newforms/fields.py

@@ -114,11 +114,11 @@ class IntegerField(Field):
     def clean(self, value):
         """
         Validates that int() can be called on the input. Returns the result
-        of int().
+        of int(). Returns None for empty values.
         """
         super(IntegerField, self).clean(value)
         if not self.required and value in EMPTY_VALUES:
-            return u''
+            return None
         try:
             value = int(value)
         except (ValueError, TypeError):