From 6125d81347e19c1b0860fc23294e424fcd751053 Mon Sep 17 00:00:00 2001
From: Antony Lee <anntzer.lee@gmail.com>
Date: Wed, 6 Jul 2016 10:55:59 -0700
Subject: [PATCH] Throw an exception if MPLBACKEND is invalid.

---
 lib/matplotlib/__init__.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/matplotlib/__init__.py b/lib/matplotlib/__init__.py
index b2b0eb1b5714..a132609c1155 100644
--- a/lib/matplotlib/__init__.py
+++ b/lib/matplotlib/__init__.py
@@ -1460,7 +1460,7 @@ def tk_window_focus():
     # variable MPLBACKEND
     try:
         use(os.environ['MPLBACKEND'])
-    except (KeyError, ValueError):
+    except KeyError:
         pass