From 7de5920dd8dd98494df0833e87aa1d1e5d03efcb Mon Sep 17 00:00:00 2001
From: Adrian Greeve <adrian@moodle.com>
Date: Tue, 3 Jun 2014 10:15:09 +0800
Subject: [PATCH] MDL-44501 mod_data: Only attempt to export files when a file
 exists.

The error only occurs when portfolios are enabled and there is only one field which is
a file field.
---
 mod/data/locallib.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mod/data/locallib.php b/mod/data/locallib.php
index 7410091455f..ae182535a3d 100644
--- a/mod/data/locallib.php
+++ b/mod/data/locallib.php
@@ -348,7 +348,9 @@ class data_portfolio_caller extends portfolio_module_caller_base {
         $includedfiles = array();
         foreach ($fields as $singlefield) {
             if (is_callable(array($singlefield, 'get_file'))) {
-                $includedfiles[] = $singlefield->get_file($record->id);
+                if ($file = $singlefield->get_file($record->id)) {
+                    $includedfiles[] = $file;
+                }
             }
         }
         if (count($includedfiles) == 1 && count($fields) == 1) {