From a13edd499d37c873a57bedad7f19bca20c12367b Mon Sep 17 00:00:00 2001
From: Damyon Wiese <damyon.wiese@netspot.com.au>
Date: Fri, 15 Jun 2012 14:42:19 +0800
Subject: [PATCH] MDL-33699: Allow grades of 0 in assignment quickgrading

---
 mod/assign/locallib.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mod/assign/locallib.php b/mod/assign/locallib.php
index 4c4d157ff83..b8d600aaa43 100644
--- a/mod/assign/locallib.php
+++ b/mod/assign/locallib.php
@@ -2593,7 +2593,11 @@ class assign {
                 // different ways to indicate no grade
                 continue;
             }
-            if ($current->grade != $modified->grade) {
+            // Treat 0 and null as different values
+            if ($current->grade !== null) {
+                $current->grade = floatval($current->grade);
+            }
+            if ($current->grade !== $modified->grade) {
                 // grade changed
                 if ($this->grading_disabled($modified->userid)) {
                     continue;