From fa1fce83db79d1c4914d2f2440f038474e223b92 Mon Sep 17 00:00:00 2001
From: Sylvain Corlay <sylvain.corlay@gmail.com>
Date: Fri, 27 Mar 2015 20:00:47 -0400
Subject: [PATCH] remove unnecessary allow_none=True

---
 IPython/html/services/clusters/clustermanager.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/IPython/html/services/clusters/clustermanager.py b/IPython/html/services/clusters/clustermanager.py
index f42827399..c0a877613 100644
--- a/IPython/html/services/clusters/clustermanager.py
+++ b/IPython/html/services/clusters/clustermanager.py
@@ -20,7 +20,7 @@ class ClusterManager(LoggingConfigurable):
     delay = Float(1., config=True,
         help="delay (in s) between starting the controller and the engines")
 
-    loop = Instance('zmq.eventloop.ioloop.IOLoop', allow_none=True)
+    loop = Instance('zmq.eventloop.ioloop.IOLoop')
     def _loop_default(self):
         from zmq.eventloop.ioloop import IOLoop
         return IOLoop.instance()