[test] Fix api.ws2p.test_ws2p.test_document_message()

which wasn't tested with unittest
I changed the expected result according to the result
This seems like a mistake/typo.

tests/api/ws2p/test_ws2p.py

@@ -206,7 +206,6 @@ class TestWs2p(unittest.TestCase):
         self.assertIn("name", dict_document_message["body"])
         self.assertIn("identity", dict_document_message["body"])
         self.assertEqual(4, dict_document_message["body"]["name"])
-        expected = """HgTTJLAQ5sqfknMq7yLPZbehtuLSsKj9CxWN7k8QvYJd\
-:J3G9oM5AKYZNLAB5Wx499w61NuUoS57JVccTShUbGpCMjCqj9yXXqNq7dyZpDWA6BxipsiaMZhujMeBfCznzyci:32\
--DB30D958EE5CB75186972286ED3F4686B8A1C2CD:lolcat"""
+        expected = """HgTTJLAQ5sqfknMq7yLPZbehtuLSsKj9CxWN7k8QvYJd:None:\
+32-DB30D958EE5CB75186972286ED3F4686B8A1C2CD:lolcat"""
         self.assertEqual(expected, dict_document_message["body"]["identity"])