Since you removed line [203](https://github.com/zendframework/zf2/pull/5968#discussion-diff-10605694L203), now `$message` will **always** be "empty". So, you can remove that [dead code](https://github.com/fabiocarneiro/zf2/blob/hotfix-collection-input-filter-messages/library/Zend/InputFilter/CollectionInputFilter.php#L190-192).