Werk #12974: Fix parse error on iCalendar import

Component	User interface
Title	Fix parse error on iCalendar import
Date	Jun 29, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0p7 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Timeperiod imports of iCalender could lead to an error "Failed to parse file: Tuple or struct_time argument required".

To the list of all Werks