From 69eb173ecaf75666e47def6ae452e356dc2c15ed Mon Sep 17 00:00:00 2001
From: Miroslav Stampar <miroslav.stampar@gmail.com>
Date: Tue, 24 May 2011 15:07:37 +0000
Subject: [PATCH] minor just in case patch

---
 lib/core/common.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/core/common.py b/lib/core/common.py
index 0086b5418..81a63bd8e 100644
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -1592,6 +1592,7 @@ def stdev(values):
         avg = average(values)
 
         for value in values:
+            value = value or 0
             summa += pow(value - avg, 2)
 
         retVal = sqrt(summa/(len(values) - 1))