Handle 0 values in columns with foreign key constraints correctly, like it's done for insert() already. Should fix syncing of maildir trees with a locally modified top-level node.
Handle 0 values in columns with foreign key constraints correctly, like
it's done for insert() already. Should fix syncing of maildir trees with
a locally modified top-level node.

svn path=/trunk/kdesupport/akonadi/; revision=1012966

kolab-groupware/akonadi,kolab-groupware/akonadi,kolab-groupware/akonadi,kolab-groupware/akonadi