Re-instated proxy test otherwise this breaks the code if no proxy is set.

Author: philipkershaw

ndg/httpsclient/https.py

@@ -78,9 +78,10 @@ def connect(self):
 
         sock = socket.create_connection((self.host, self.port), self.timeout)
 
-        # Tunnel if using a proxy
-        self.sock = sock
-        self._tunnel()
+        # Tunnel if using a proxy - ONLY available for Python 2.6.2 and above
+        if getattr(self, '_tunnel_host', None):
+            self.sock = sock
+            self._tunnel()
 
         self.sock = SSLSocket(ssl_context, sock)