fix PHP warning when file doesn't exists

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/staticpub/trunk@81908 735d13b6-9817-0410-8766-e36946ffe9aa
change version to 1.2.16

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/staticpub/trunk@81909 735d13b6-9817-0410-8766-e36946ffe9aa