Merge branch 'MDL-61107_33' of git://github.com/timhunt/moodle into MOODLE_33_STABLE

Author: David Monllao

Diff for: mod/quiz/edit.php

@@ -159,8 +159,8 @@
 if (optional_param('savechanges', false, PARAM_BOOL) && confirm_sesskey()) {
 
     // If rescaling is required save the new maximum.
-    $maxgrade = unformat_float(optional_param('maxgrade', -1, PARAM_RAW));
-    if ($maxgrade >= 0) {
+    $maxgrade = unformat_float(optional_param('maxgrade', '', PARAM_RAW_TRIMMED), true);
+    if (is_float($maxgrade) && $maxgrade >= 0) {
         quiz_set_grade($maxgrade, $quiz);
         quiz_update_all_final_grades($quiz);
         quiz_update_grades($quiz, 0, true);