[2.3.0] Checkmk Werk 16797 created: Ruleset API: Fix KeyError for nested form_specs.DictGroup

[//]: # (werk v2) # Ruleset API: Fix KeyError for nested form_specs.DictGroup key | value ---------- | --- date | 2024-05-23T09:54:29+00:00 version | 2.3.0p4 class | fix edition | cre component | checks level | 1 compatible | yes This is only relevant for plugin developers. In some cases when a `DictGroup` was used inside a FormSpec hierarchy an error would occur during validation of the relevant rule (e.g. when saving): ``` KeyError: 'DictGroup(title=<title>,help_text=<help_text>)' ```