When using pretty outdated "Do hardware/software Inventory" rules which
have been saved before 1.4, this could lead to crashing Check_MK and
Check_MK HW/SW inventory services with errors like this:
'NoneType' object has no attribute 'get'
Workaround: Open this ruleset and save the rules in the relevant folders.
The configs will then be transformed and rewritten in the current format
which prevents this crash.
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