From 83dd037f43e8bfee4f94f53e81eecd695322717a Mon Sep 17 00:00:00 2001
From: Tim Hunt <T.J.Hunt@open.ac.uk>
Date: Thu, 15 Dec 2011 12:50:49 +0000
Subject: [PATCH] MDL-30758 quiz_statistics report fails if all 1st attempts
 require grading

---
 mod/quiz/report/statistics/report.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mod/quiz/report/statistics/report.php b/mod/quiz/report/statistics/report.php
index 47447757d91..d8ae4e47661 100644
--- a/mod/quiz/report/statistics/report.php
+++ b/mod/quiz/report/statistics/report.php
@@ -667,7 +667,7 @@ class quiz_statistics_report extends quiz_default_report {
             $firstattempts = new stdClass();
             $firstattempts->countrecs = 0;
             $firstattempts->total = 0;
-            $firstattempts->average = '-';
+            $firstattempts->average = null;
         }
 
         $allattempts = new stdClass();