If the extension or dialplan xml directories are disabled or don't exist don't add sub directories.

core/upgrade/app_defaults.php

@@ -27,7 +27,9 @@
 if (strlen($_SESSION['switch']['scripts']['dir']) > 0) {
 
 	//if the resource scripts resource directory does not exist then create it
-		if (!is_dir($_SESSION['switch']['scripts']['dir']."/resources")) { mkdir($_SESSION['switch']['scripts']['dir']."/resources",0755,true); }
+		if (strlen($_SESSION['switch']['scripts']['dir']) > 0) {
+			if (!is_dir($_SESSION['switch']['scripts']['dir']."/resources")) { mkdir($_SESSION['switch']['scripts']['dir']."/resources",0755,true); }
+		}
 
 	//get odbc information
 		$sql = "select count(*) as num_rows from v_databases ";