whois: fixup date reporting

src/surykatka/bot.py

@@ -373,13 +373,16 @@ class WebBot:
                     "registrar": domain_change["registrar"],
                     "whois_server": domain_change["whois_server"],
                     "creation_date": rfc822(domain_change["creation_date"])
-                    if (domain_change["creation_date"] is not None)
+                    if (
+                        type(domain_change["creation_date"])
+                        is datetime.datetime
+                    )
                     else None,
                     "updated_date": rfc822(domain_change["updated_date"])
-                    if (domain_change["updated_date"] is not None)
+                    if (domain_change["updated_date"] is datetime.datetime)
                     else None,
                     "expiration_date": rfc822(domain_change["expiration_date"])
-                    if (domain_change["expiration_date"] is not None)
+                    if (domain_change["expiration_date"] is datetime.datetime)
                     else None,
                     "name_servers": domain_change["name_servers"],
                     "whois_status": domain_change["whois_status"],