[PHP Warning] Undefined array key "core"

Not really an issue. Our cronjob sent this warning while running. Involved code is: line 97 https://lab.civicrm.org/extensions/uplang/-/blame/master/CRM/Uplang/Utils.php?ref_type=heads#L97

      try {
        // Download core translation files
        $remoteURL = "https://download.civicrm.org/civicrm-l10n-core/mo/$locale/civicrm.mo";
        $localFile = "$l10n/$locale/LC_MESSAGES/civicrm.mo";
        if (CRM_Uplang_Utils::downloadFile($remoteURL, $localFile)) {
          $downloaded['core']++;
        }