Werk #12549: Fix parent scan

Component Setup
Title Fix parent scan
Date Mar 15, 2021
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.1.0i1 2.0.0p1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

The parent scan job always failed with an exception like "TypeError: tuple indices must be integers or slices, not str".

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