From d0ff90ed4f0935239c4e13604743900c489e2d9a Mon Sep 17 00:00:00 2001
From: Eloy Lafuente <stronk7@moodle.org>
Date: Tue, 2 Nov 2010 01:05:43 +0000
Subject: [PATCH] MDL-25000 backup - prevent calling get_mapping() with empty
 ids. Yay, 25000!

---
 .../backup/moodle2/restore_qtype_multichoice_plugin.class.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/question/type/multichoice/backup/moodle2/restore_qtype_multichoice_plugin.class.php b/question/type/multichoice/backup/moodle2/restore_qtype_multichoice_plugin.class.php
index 728541e4429..7ea7899a7b8 100644
--- a/question/type/multichoice/backup/moodle2/restore_qtype_multichoice_plugin.class.php
+++ b/question/type/multichoice/backup/moodle2/restore_qtype_multichoice_plugin.class.php
@@ -102,13 +102,13 @@ class restore_qtype_multichoice_plugin extends restore_qtype_plugin {
         }
         // Map order
         foreach (explode(',', $lists[0]) as $id) {
-            if ($newid = $this->get_mappingid('question_answer', $id)) {
+            if (!empty($id) && $newid = $this->get_mappingid('question_answer', $id)) {
                 $orderarr[] = $newid;
             }
         }
         // Map responses
         foreach (explode(',', $lists[1]) as $id) {
-            if ($newid = $this->get_mappingid('question_answer', $id)) {
+            if (!empty($id) && $newid = $this->get_mappingid('question_answer', $id)) {
                 $responsesarr[] = $newid;
             }
         }