From aa3133bcb99485a59170381ef94439e243eb188c Mon Sep 17 00:00:00 2001
From: jamiesensei <jamiesensei>
Date: Wed, 30 Jul 2008 09:49:09 +0000
Subject: [PATCH] MDL-15268 "Content for Quiz Statistics report table" display
 blank cell if statistic is not calculatable

---
 mod/quiz/report/statistics/statistics_table.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mod/quiz/report/statistics/statistics_table.php b/mod/quiz/report/statistics/statistics_table.php
index 366aefc1eb..e2a33acb0d 100644
--- a/mod/quiz/report/statistics/statistics_table.php
+++ b/mod/quiz/report/statistics/statistics_table.php
@@ -160,7 +160,11 @@ class quiz_report_statistics_table extends flexible_table {
     }
     
     function col_sd($question){
-        return number_format($question->_stats->sd*100 / $question->_stats->maxgrade, 2).'%';
+        if (!is_null($question->_stats->sd)){
+            return number_format($question->_stats->sd*100 / $question->_stats->maxgrade, 2).'%';
+        } else {
+            return '';
+        }
     }
     function col_s($question){
         if (isset($question->_stats->s)){
-- 
2.39.5