avoid notice in error log from user_webfinger app

apps/user_webfinger/host-meta.php

@@ -10,7 +10,7 @@ echo "<";
 ?xml version="1.0" encoding="UTF-8"?>
 <XRD xmlns="http://docs.oasis-open.org/ns/xri/xrd-1.0" xmlns:hm="http://host-meta.net/xrd/1.0">
 	<hm:Host xmlns="http://host-meta.net/xrd/1.0"><?php echo $_SERVER['SERVER_NAME'] ?></hm:Host>
-	<Link rel="lrdd" template="http<?php echo ($_SERVER['HTTPS']?'s':''); ?>://<?php echo $_SERVER['SERVER_NAME'] ?>/.well-known/webfinger.php?q={uri}">
+	<Link rel="lrdd" template="http<?php echo (isset($_SERVER['HTTPS'])?'s':''); ?>://<?php echo $_SERVER['SERVER_NAME'] ?>/.well-known/webfinger.php?q={uri}">
 	</Link>
 </XRD>
 

apps/user_webfinger/webfinger.php

@@ -22,7 +22,7 @@ if($_GET['q']) {
 if(substr($userName, 0, 5) == 'acct:') {
 	$userName = substr($userName, 5);
 }
-if($_SERVER['HTTPS']) {
+if(isset($_SERVER['HTTPS'])) {
 	$baseAddress = 'https://'.$_SERVER['SERVER_NAME'].'/apps/remoteStorage/';
 } else {
 	$baseAddress = 'http://'.$_SERVER['SERVER_NAME'].'/apps/remoteStorage/';