Werk #11903: Fix crash in hearbeat CRM general

Component Checks & Agents
Title Fix crash in hearbeat CRM general
Date Feb 1, 2021
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.1.0i1 2.0.0b6 1.6.0p21
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

Fix cases where the Heartbeat CRM would crash with TypeError (%d format: a number is required, not NoneType)

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