Checkmk Werk 15212: host_tag_groups: allow nullable on tag group choice ident

ID: 15212 Title: host_tag_groups: allow nullable on tag group choice ident Component: REST API Level: 1 Class: Bug fix Version: 2.2.0i1 On creating a Tag Group, the tag group choice ident field can be null. Response schema updated to reflect this. Also, HostTagGroup ident field should be required. This field has also been updated.