Checkmk Werk 12071: Fix default active time range on iCalendar timeperiod imports

ID: 12071 Title: Fix default active time range on iCalendar timeperiod imports Component: Multisite Level: 1 Class: Bug fix Version: 2.1.0i1 If you imported a timeperiod via the option "Import iCalendar" with version 1.6 upwards, a default active time range was set. This could leed to unwanted send notifications. Timeperiods imported with version 1.5 are not affected.