Werk #12069: Fix "Failed to parse file" error on iCalendar import

Component	User interface
Title	Fix "Failed to parse file" error on iCalendar import
Date	Feb 15, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0b7 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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