(legacy) fix some more warnings

src/etc/inc/vpn.inc

@@ -1370,7 +1370,7 @@ function vpn_l2tp_configure()
 
 	@mkdir('/var/etc/l2tp-vpn');
 
-	switch ($l2tpcfg['mode']) {
+	switch (isset($l2tpcfg['mode'])?$l2tpcfg['mode']:null) {
 
 		case 'server' :
 			if ($l2tpcfg['paporchap'] == "chap")

src/www/vpn_l2tp_users.php

@@ -32,7 +32,8 @@ $shortcut_section = "l2tps";
 require_once("guiconfig.inc");
 require_once("vpn.inc");
 
-if (!is_array($config['l2tp']['user'])) {
+
+if (!isset($config['l2tp']['user'])) {
     $config['l2tp']['user'] = array();
 }
 $a_secret = &$config['l2tp']['user'];

src/www/vpn_openvpn_export.php

@@ -668,7 +668,7 @@ endforeach; ?>
 											<option value="servermagic" >Automagic Multi-WAN IPs (port forward targets)</option>
 											<option value="servermagichost" >Automagic Multi-WAN DDNS Hostnames (port forward targets)</option>
 											<option value="serverhostname" >Installation hostname</option>
-											<?php if (is_array($config['dyndnses']['dyndns'])) :
+											<?php if (isset($config['dyndnses']['dyndns'])) :
 ?>
 												<?php foreach ($config['dyndnses']['dyndns'] as $ddns) :
 ?>
@@ -677,7 +677,7 @@ endforeach; ?>
 endforeach; ?>
 											<?php
 endif; ?>
-											<?php if (is_array($config['dnsupdates']['dnsupdate'])) :
+											<?php if (isset($config['dnsupdates']['dnsupdate'])) :
 ?>
 												<?php foreach ($config['dnsupdates']['dnsupdate'] as $ddns) :
 ?>