From 379bac1fe74cc3c77cbf2849a9bc85f1c87448ab Mon Sep 17 00:00:00 2001
From: Paul Holden <paulh@moodle.com>
Date: Fri, 22 Sep 2023 14:32:11 +0100
Subject: [PATCH] MDL-79467 output: handle empty sitename display during
 installation.

Causes PHP warnings when null on PHP 8.1.
---
 lib/pagelib.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/pagelib.php b/lib/pagelib.php
index 0c2069a44eb..70bb1483738 100644
--- a/lib/pagelib.php
+++ b/lib/pagelib.php
@@ -1405,7 +1405,7 @@ class moodle_page {
                 $sitenamedisplay = $CFG->sitenameintitle;
             }
             $site = get_site();
-            if (empty(trim($site->{$sitenamedisplay}))) {
+            if (empty(trim($site->{$sitenamedisplay} ?? ''))) {
                 // If for some reason the site name is not yet set, fall back to 'Moodle'.
                 $title .= self::TITLE_SEPARATOR . 'Moodle';
             } else {