Werk #8883: Fix possible "module has no attribute core" issue

Component Core & setup
Title Fix possible "module has no attribute core" issue
Date Sep 4, 2019
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.6.0b9 2.0.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

When configuring timespecific parameters or check periods, such an exception could occur during checking. We have only seen this issue when using the raw edition.

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