Werk #14772: Fix crash when deleting custom MIB in EC

Component	Setup
Title	Fix crash when deleting custom MIB in EC
Date	Sep 22, 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 2.1.0p13 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Attempting to delete a MIB under "SNMP MIBs for trap translation" of the event console would fail and crash with the error TypeError (unsupported operand type(s) for +: 'PosixPath' and 'str')

This has been fixed.

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