Check_MK Werk 8676: Fixed edge cases for various Livestatus columns.

ID: 8676 Title: Fixed edge cases for various Livestatus columns. Component: Livestatus Level: 1 Class: Bug Fix Version: 1.4.0i4 All host/service-related tables had some issues with various columns: * The columns "comments", "comments_with_info", "downtimes" and "downtimes_with_info" could miss some data. * The "metrics" column did not always contain a list. The bugs only manifested for some rare edge cases, and only CMC was affected.