Werk #13162: check_mk_active: fix "AttributeError: 'NoneType' object has no attribute 'split'

Component	Checks & agents
Title	check_mk_active: fix "AttributeError: 'NoneType' object has no attribute 'split'
Date	Sep 9, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p10 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

This werk fixes the following issue with the check_mk_active:

• When the option warn/crit-age-oldest or warn/crit-age-newest was used the following error could occur: "AttributeError: 'NoneType' object has no attribute 'split'"

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