Check_MK Werk 5469: Fixed acknowledgement notifications when RBN is disabled

ID: 5469 Title: Fixed acknowledgement notifications when RBN is disabled Component: Core & setup Level: 1 Class: Bug fix Version: 1.5.0i2 When an ACKNOWLEDGE_{HOST,SVC}_PROBLEM command is issued to the core (via the GUI or via Livestatus) and rule-based notifications are disabled, the CMC segfaulted. This has been fixed.