Check_MK Werk 4692: Correctly handle deactivated event console when Nagios core is used.

ID: 4692 Title: Correctly handle deactivated event console when Nagios core is used. Component: Livestatus Level: 1 Class: Bug fix Version: 1.5.0i1 This fix avoids log entries and exceptions of the form: "[mkeventd at /omd/sites/stable/tmp/run/mkeventd/status] cannot connect: No such file or directory"