tsk3223 BUG: Argument 1 passed to Tx_HappyFeet_Domain_Repository_FootnoteRepository::getFootnotesByUids() must be an array, null given (sto450)
 * Fixed critical fatal error which was produced by not validated parameter

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/happy_feet/trunk@84089 735d13b6-9817-0410-8766-e36946ffe9aa