Werk #12315: check: liebert_temp_air: fix Attribute Error

Component Checks & agents
Title check: liebert_temp_air: fix Attribute Error
Date Apr 14, 2021
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.0.0p3 2.1.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

The check liebert_temp_air crashed with "AttributeError ('NoneType' object has no attribute 'get')". This should now be fixed.

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