Checkmk Werk 14682: Guard Livestatus against Nagios custom variables with an empty value.

ID: 14682 Title: Guard Livestatus against Nagios custom variables with an empty value. Component: Livestatus Level: 1 Class: Bug fix Version: 2.2.0i1 When Nagios is configured with custom variables having an empty value, various Livestatus queries can crash the Nagios core. This has been fixed. Reported by GitHub user ronansalmon, including a similar fix.