Fix DROP ALL OBJECTS and DROP SCHEMA in the presence of tables with computed column dependencies.

git-svn-id: http://h2database.googlecode.com/svn/trunk@5057 e6896862-9d19-0410-bfb3-e9fa5d50e656
fix NPE when running TestFuzzOptimisations

git-svn-id: http://h2database.googlecode.com/svn/trunk@5058 e6896862-9d19-0410-bfb3-e9fa5d50e656