allow Optional int for port

sydent/replication/peer.py

@@ -132,15 +132,17 @@ def __init__(
         :param lastSentVersion: The ID of the last association sent to the peer.
         """
         super().__init__(server_name, pubkeys)
+
+        if port is None:
+            port = 1001
+
         self.sydent = sydent
         self.lastSentVersion = lastSentVersion
 
         # look up or build the replication URL
         replication_url = self.sydent.config.http.base_replication_urls.get(server_name)
 
         if replication_url is None:
-            if not port:
-                port = 1001
             replication_url = "https://%s:%i" % (server_name, port)
 
         if replication_url[-1:] != "/":