Werk #9516: Fix site migration

Component Firmware
Title Fix site migration
Date Mar 20, 2023
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed
Appliance Version 1.6.4

When trying to start a site migration, the process terminated with an error "TypeError (init() missing 1 required positional argument: 'migration_cfg')".

This regression affects all previous 1.6 releases.

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