Title: Fixed broken nagios config when using RBN without a host defined
Level: 1
Component: core
Class: fix
Compatible: compat
State: unknown
Version: 1.2.7i1
Date: 1421066674

Check_MK generated a broken configuration where the contact group 'check-mk-notify'
was missing when rule based notifications (RBN) were enabled without a single
host configured.
