Index: trunk/admin/install/upgrade_errors.php
===================================================================
diff -u -r2067 -r2536
--- trunk/admin/install/upgrade_errors.php	(.../upgrade_errors.php)	(revision 2067)
+++ trunk/admin/install/upgrade_errors.php	(.../upgrade_errors.php)	(revision 2536)
@@ -1,7 +1,7 @@
 <?php 
 
 $pathtoroot = "";
-if(!strlen($pathtoroot))
+if( !(isset($pathtoroot) && $pathtoroot) )
 {
   //$path=dirname(realpath(__FILE__));PATH_TRANSLATED
   $path=dirname(realpath(__FILE__));
@@ -45,7 +45,7 @@
 	  $p = "";
       }
     }
-    if(!strlen($pathtoroot))
+    if( !(isset($pathtoroot) && $pathtoroot) )
       $pathtoroot = ".".$pathchar;
   }
   else