Fix for Moodle 4.1

The settings page is ignored on install so when the admin settings page
is next loaded, the default settings cannot be found and undefined offset
warnings are thrown.

settings.php

@@ -26,25 +26,30 @@
  * @var admin_settingpage $settings
  * @var bootstrap_renderer $OUTPUT
  * @var admin_root $ADMIN
+ * @var moodle_page $PAGE
  */
 use auth_outage\local\outagelib;
 
 defined('MOODLE_INTERNAL') || die;
 
-if ($hassiteconfig && is_enabled_auth('outage')) {
+if ($hassiteconfig) {
     $defaults = outagelib::get_config_defaults();
     $settings->visiblename = get_string('menusettings', 'auth_outage');
+    $description = outagelib::generate_plugin_configuration_warning();
 
     $settings->add(new admin_setting_heading(
         'defaults',
         get_string('settingssectiondefaults', 'auth_outage'),
-        get_string('settingssectiondefaultsdescription', 'auth_outage')));
+        get_string('settingssectiondefaultsdescription', 'auth_outage') . $description
+    ));
+
     $settings->add(new admin_setting_configcheckbox(
         'auth_outage/default_autostart',
         get_string('defaultoutageautostart', 'auth_outage'),
         get_string('defaultoutageautostartdescription', 'auth_outage'),
         $defaults['default_autostart']
     ));
+
     $settings->add(new admin_setting_configduration(
         'auth_outage/default_warning_duration',
         get_string('defaultwarningduration', 'auth_outage'),
@@ -96,21 +101,22 @@
 
     // Create 'Allowed IPs' settings.
     $allowedips = outagelib::get_config()->allowedips;
-    $description = outagelib::generate_plugin_configuration_warning();
     if (trim($allowedips) == '') {
         $message = 'allowedipsempty';
         $type = 'notifymessage';
-    } else if (remoteip_in_list($allowedips)) {
-        $message = 'allowedipshasmyip';
-        $type = 'notifysuccess';
     } else {
-        $message = 'allowedipshasntmyip';
-        $type = 'notifyerror';
+        if (remoteip_in_list($allowedips)) {
+            $message = 'allowedipshasmyip';
+            $type = 'notifysuccess';
+        } else {
+            $message = 'allowedipshasntmyip';
+            $type = 'notifyerror';
+        }
     };
-    $description .= $OUTPUT->notification(get_string($message, 'auth_outage', ['ip' => getremoteaddr()]), $type);
+    $description = $OUTPUT->notification(get_string($message, 'auth_outage', ['ip' => getremoteaddr()]), $type);
 
-    $description .= '<p>'.get_string('ipblockersyntax', 'admin').'</p>';
-    $description .= '<p>'.get_string('ips_combine', 'auth_outage').'</p>';
+    $description .= '<p>' . get_string('ipblockersyntax', 'admin') . '</p>';
+    $description .= '<p>' . get_string('ips_combine', 'auth_outage') . '</p>';
 
     $iplist = new admin_setting_configiplist(
         'auth_outage/allowedips',
@@ -150,7 +156,7 @@
         new admin_externalpage(
             'auth_outage_manage',
             get_string('menumanage', 'auth_outage'),
-            new moodle_url($CFG->wwwroot.'/auth/outage/manage.php')
+            new moodle_url($CFG->wwwroot . '/auth/outage/manage.php')
         )
     );
 }