Updated connection refs MongoEngine#474

Author: rozza

docs/changelog.rst

@@ -5,6 +5,7 @@ Changelog
 Changes in 0.6.X
 ================
 
+- updated replicasetconnection - pop port if exists
 - bug fix for unknown connection alias error message
 
 Changes in 0.6.3

mongoengine/connection.py

@@ -105,13 +105,13 @@ def get_connection(alias=DEFAULT_CONNECTION_NAME, reconnect=False):
                 for slave_alias in conn_settings['slaves']:
                     slaves.append(get_connection(slave_alias))
                 conn_settings['slaves'] = slaves
-                conn_settings.pop('read_preference')
+                conn_settings.pop('read_preference', None)
 
         connection_class = Connection
         if 'replicaSet' in conn_settings:
             conn_settings['hosts_or_uri'] = conn_settings.pop('host', None)
             # Discard port since it can't be used on ReplicaSetConnection
-            conn_settings.pop('port')
+            conn_settings.pop('port', None)
             connection_class = ReplicaSetConnection
         try:
             _connections[alias] = connection_class(**conn_settings)