From 153bc6edf9a450d6fb585ba73699e7b37e7bb6b8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johannes=20Sch=C3=B6nberger?= <jschoenberger@demuc.de>
Date: Wed, 29 May 2013 20:28:16 +0200
Subject: [PATCH] Use None instead of 'none' for qt backend

---
 skimage/viewer/qt/__init__.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/skimage/viewer/qt/__init__.py b/skimage/viewer/qt/__init__.py
index 55cafcfe..c816a172 100644
--- a/skimage/viewer/qt/__init__.py
+++ b/skimage/viewer/qt/__init__.py
@@ -12,7 +12,7 @@ if qt_api is None:
             import PyQt4
             qt_api = 'pyqt'
         except ImportError:
-            qt_api = 'none'
+            qt_api = None
             # Note that we don't want to raise an error because that would
             # cause the TravisCI build to fail.
             warnings.warn("Could not import PyQt4: ImageViewer not available!")