Index: file.php
===================================================================
RCS file: /cvsroot/moodle/moodle/file.php,v
retrieving revision 1.44.2.1
diff -u -r1.44.2.1 file.php
--- file.php	2 Apr 2007 16:12:26 -0000	1.44.2.1
+++ file.php	25 Sep 2007 09:19:47 -0000
@@ -14,7 +14,7 @@
     require_once('config.php');
     require_once('lib/filelib.php');
 
-    if (empty($CFG->filelifetime)) {
+    if (!isset($CFG->filelifetime)) {
         $lifetime = 86400;     // Seconds for files to remain in caches
     } else {
         $lifetime = $CFG->filelifetime;