[2.2.0] Checkmk Werk 16891 created: check_ewon: TypeError ('NoneType' object is not subscriptable) raised if values for levels are missing

Title: check_ewon: TypeError ('NoneType' object is not subscriptable) raised if values for levels are missing Class: fix Compatible: compat Component: checks Date: 1724069620 Edition: cre Level: 1 Version: 2.2.0p33 In case values for `levels` are missing and `None` taken instead, running the check function would crash with `TypeError ('NoneType' object is not subscriptable)`. This change hard codes some default values in case no values could be extracted.