LIRS cache: bugfix for caches that only contain non-resident entries.

git-svn-id: http://h2database.googlecode.com/svn/trunk@5232 e6896862-9d19-0410-bfb3-e9fa5d50e656
Documentation

git-svn-id: http://h2database.googlecode.com/svn/trunk@5233 e6896862-9d19-0410-bfb3-e9fa5d50e656