From 0a36b931e210e62745e68c17380244d5d149e52f Mon Sep 17 00:00:00 2001
From: Adrian Greeve <adrian@moodle.com>
Date: Tue, 20 Dec 2016 14:01:30 +0800
Subject: [PATCH] MDL-57366 mod_lesson: Zero now acceptable numeric answer.

When creating a numerical question. If the answer to the
question is 0 then the answer will not save.
---
 mod/lesson/locallib.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mod/lesson/locallib.php b/mod/lesson/locallib.php
index 160d80f89cb..4e02e441fc5 100644
--- a/mod/lesson/locallib.php
+++ b/mod/lesson/locallib.php
@@ -2955,7 +2955,7 @@ abstract class lesson_page extends lesson_base {
         for ($i = 0; $i < $this->lesson->maxanswers; $i++) {
             $answer = clone($newanswer);
 
-            if (!empty($properties->answer_editor[$i])) {
+            if (isset($properties->answer_editor[$i])) {
                 if (is_array($properties->answer_editor[$i])) {
                     // Multichoice and true/false pages have an HTML editor.
                     $answer->answer = $properties->answer_editor[$i]['text'];