Test and remove unncessary clean

Author: Fantomas42

tagging/forms.py

@@ -33,8 +33,6 @@ class TagField(forms.CharField):
     """
     def clean(self, value):
         value = super(TagField, self).clean(value)
-        if value == '':
-            return value
         for tag_name in parse_tag_input(value):
             if len(tag_name) > settings.MAX_TAG_LENGTH:
                 raise forms.ValidationError(

tagging/tests/tests.py

@@ -1021,7 +1021,8 @@ def test_recreation_of_tag_list_string_representations(self):
                          '"com,ma", spa ces')
 
     def test_tag_d_validation(self):
-        t = TagField()
+        t = TagField(required=False)
+        self.assertEqual(t.clean(''), '')
         self.assertEqual(t.clean('foo'), 'foo')
         self.assertEqual(t.clean('foo bar baz'), 'foo bar baz')
         self.assertEqual(t.clean('foo,bar,baz'), 'foo,bar,baz')