From b2db0706c69c65e693d4e17eb14ea6349aeb1a50 Mon Sep 17 00:00:00 2001
From: Daniel Pavel <daniel.pavel@gmail.com>
Date: Thu, 8 Nov 2012 00:28:40 +0200
Subject: [PATCH] handle better devices which do not support feature calls

---
 app/receiver.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/receiver.py b/app/receiver.py
index f82c133e..9c928ea2 100644
--- a/app/receiver.py
+++ b/app/receiver.py
@@ -37,7 +37,7 @@ class _FeaturesArray(object):
 				except _api._FeatureNotSupported:
 					self.supported = False
 				else:
-					count = _base.request(handle, self.device.number, _pack('!BB', index, 0x00))
+					count = None if index is None else _base.request(handle, self.device.number, _pack('!BB', index, 0x00))
 					if count is None:
 						self.supported = False
 					else: