Allow servers command to work without a password.

Author: anthonyu

src/api/controller/ServerListController.py

@@ -15,6 +15,9 @@ def read_server_config(self):
         redis_servers = settings.get_redis_servers()
 
         for server in redis_servers:
+            if 'password' not in server:
+              server['password'] = None
+
             server_id = "%(server)s:%(port)s" % server
             s = dict(server=server['server'], port=server['port'], password=server['password'], id=server_id)
             server_list.append(s)