Fixed serializers test crash if PyYAML isn't installed.
Follow up to
@@ -116,7 +116,7 @@ class YamlSerializerTestCase(SerializersTestBase, TestCase):
headline: Poker has no place on ESPN
pub_date: 2006-06-16 11:00:00
categories:""" + (
- ' [%(first_category_pk)s, %(second_category_pk)s]' if yaml.__version__ < '5.1'
+ ' [%(first_category_pk)s, %(second_category_pk)s]' if HAS_YAML and yaml.__version__ < '5.1'
else '\n - %(first_category_pk)s\n - %(second_category_pk)s') + """
meta_data: []
"""
