issue 1370 add exception, when can not read directory list with ftp

git-svn-id: http://xe-core.googlecode.com/svn/branches/1.5.0@10281 201d5d3c-b55e-5fd7-737f-ddc643e51545

modules/admin/admin.admin.model.php

@@ -91,6 +91,10 @@
                     if(strpos($v,'d') === 0 || strpos($v, '<DIR>')) $list[] = substr(strrchr($v,' '),1) . '/';
                 }
             }
+			else
+			{
+				return new Object(-1,'msg_ftp_no_directory');
+			}
             $this->add('list', $list);
         }