Werk #14680: Fix crash in heartbeat_crm plugin

Component	Checks & agents
Title	Fix crash in heartbeat_crm plugin
Date	Aug 31, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

The heartbeat_crm check would crash with a KeyError when the rule "Heartbeat CRM general status" was not set.

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