From 8c2ece3bca24c8b6452860db916713b55455050e Mon Sep 17 00:00:00 2001
From: Lance Stout <lancestout@gmail.com>
Date: Sat, 4 Aug 2012 21:37:46 -0700
Subject: [PATCH] Ensure self._der_cert exists even if no certs are used.

---
 sleekxmpp/xmlstream/xmlstream.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sleekxmpp/xmlstream/xmlstream.py b/sleekxmpp/xmlstream/xmlstream.py
index 4e5e2fe4..216c0ed3 100644
--- a/sleekxmpp/xmlstream/xmlstream.py
+++ b/sleekxmpp/xmlstream/xmlstream.py
@@ -147,6 +147,8 @@ class XMLStream(object):
         #: client certificate to use for authenticating via SASL EXTERNAL.
         self.keyfile = None
 
+        self._der_cert = None
+
         #: The time in seconds to wait for events from the event queue,
         #: and also the time between checks for the process stop signal.
         self.wait_timeout = WAIT_TIMEOUT