Fix php warning in settings utility

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/pw_teaser/trunk@84978 735d13b6-9817-0410-8766-e36946ffe9aa
Version 3.1.1

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/pw_teaser/trunk@84979 735d13b6-9817-0410-8766-e36946ffe9aa