'\'required=False\' should allow a dictionary key to be missing in output.'

def test_not_required_output_for_dict(self):

    class ExampleSerializer(serializers.Serializer, ):
        omitted = serializers.CharField(required=False)
        included = serializers.CharField()
    serializer = ExampleSerializer(data={u'included': u'abc'})
    serializer.is_valid()
    assert (serializer.data == {u'included': u'abc'})
