Ticket #3482: 4490.diff

django/newforms/fields.py

@@ -373 +373 @@
             raise ValidationError(gettext(u'This field is required.'))
         elif not self.required and not value:
             return []
+        elif not self.required and len(value) == 1 and not value[0]:
+            return value
         if not isinstance(value, (list, tuple)):
             raise ValidationError(gettext(u'Enter a list of values.'))
         new_value = []

tests/regressiontests/forms/tests.py

@@ -1574 +1574 @@
 []
 >>> f.clean(None)
 []
+>>> f.clean([''])
+['']
 >>> f.clean([1])
 [u'1']
 >>> f.clean(['1'])