fix: last_seen has to be after first_seen, and it should habe been fa…

…iling before.

tests/testlive_comprehensive.py

@@ -2283,6 +2283,7 @@ def test_first_last_seen(self):
             # Attribute in object only
             now = datetime.now().astimezone()
             attr = obj.attributes[0]
+            attr.first_seen = '2020-01-04'
             attr.last_seen = now
             attr = self.admin_misp_connector.update_attribute(attr, pythonify=True)
             self.assertEqual(attr.last_seen, now)