From 96e43cf5bd46d602adfebaa48eb18add5a99c384 Mon Sep 17 00:00:00 2001
From: Rumyana Neykova <rumi.neykova@gmail.com>
Date: Thu, 23 Aug 2012 10:56:11 +0100
Subject: [PATCH] Add default routing key to exchange_bind.

---
 kombu/entity.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kombu/entity.py b/kombu/entity.py
index ddc9b550..e72ac7e1 100644
--- a/kombu/entity.py
+++ b/kombu/entity.py
@@ -157,7 +157,7 @@ class Exchange(MaybeChannelBound):
                                              nowait=nowait,
                                              passive=passive)
 
-    def exchange_bind(self, source = '', routing_key = None, 
+    def exchange_bind(self, source = '', routing_key = '', 
                       nowait = False, **kwargs):
         """Binds the exchange to another exchange.