Werk #13877: Fix possible UnicodeDecodeError on notify of users via mail

Component	Notifications
Title	Fix possible UnicodeDecodeError on notify of users via mail
Date	Apr 8, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0b6 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p23 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Notifying users with the option "Send an E-Mail" via "Notify users" could lead to an UnicodeDecodeError.

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