From d24f9aa8a188d1537cfd908d028ac0cb1546178a Mon Sep 17 00:00:00 2001
From: Beatrycze Volk <beatrycze.volk@slub-dresden.de>
Date: Thu, 30 May 2024 14:01:44 +0200
Subject: [PATCH] [BUGFIX] Fix warnings for undefined array keys in `Mods`
 class (#1227)

Co-authored-by: Sebastian Meyer <sebastian.meyer@opencultureconsulting.com>
---
 Classes/Format/Mods.php | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Classes/Format/Mods.php b/Classes/Format/Mods.php
index c62f3605c..3905a4e8e 100644
--- a/Classes/Format/Mods.php
+++ b/Classes/Format/Mods.php
@@ -273,7 +273,7 @@ private function getHolderFromXml(array $holders, int $i): void
      * Get holder from XML display form.
      *
      * @access private
-     * 
+     *
      * @param array $holders
      * @param int $i
      *
@@ -306,7 +306,7 @@ private function getPlaces(): void
         if (!empty($places)) {
             foreach ($places as $place) {
                 $this->metadata['place'][] = (string) $place;
-                if (!$this->metadata['place_sorting'][0]) {
+                if (empty($this->metadata['place_sorting'][0])) {
                     $this->metadata['place_sorting'][0] = preg_replace('/[[:punct:]]/', '', (string) $place);
                 }
             }
@@ -339,7 +339,7 @@ private function getYears(): void
         if (!empty($years)) {
             foreach ($years as $year) {
                 $this->metadata['year'][] = (string) $year;
-                if (!$this->metadata['year_sorting'][0]) {
+                if (empty($this->metadata['year_sorting'][0])) {
                     $yearSorting = str_ireplace('x', '5', preg_replace('/[^\d.x]/i', '', (string) $year));
                     if (
                         strpos($yearSorting, '.')