MDL-15268 "Content for Quiz Statistics report table" display blank cell if statistic is not calculatable

2008-07-30 09:49:09 +00:00
parent 7b3c273b1d
commit aa3133bcb9
1 changed files with 5 additions and 1 deletions
@@ -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)){