Related to http://issues.ez.no/IssueView.php?Id=17249&

If there is no source in keyword block it also get 0 item.

Steps to reproduce

In ezflow admin
Assume there is node "object1" whose keyword is A
1) edit frontpage
2) add keyword block
3) input keyword A but don't select source
4) publish frontpage
verify the frontpage has "object1" in keyword block