Werk #12010: Fix for config update: Regex validation will ignore items that are not dictionaries

Since checkmk version 2.0.0b7 the Checkmk update procedure (cmk-update-config) validates regexes. This validation failed with the error message "AttributeError: 'str' object has no attribute 'get'" if the item of a rule was not of the type "dict" or "None". We can skip the regex validation if the item is not of type "dict".

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