Task 2825.19: fix missing interface in some cases

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/multicolumn/trunk@79681 735d13b6-9817-0410-8766-e36946ffe9aa
Task 2825.19: fix typo

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/multicolumn/trunk@79682 735d13b6-9817-0410-8766-e36946ffe9aa