Checkmk Werk 12456: API Hosttag configuration: Fixed exception on changing tag configuration

ID: 12456 Title: API Hosttag configuration: Fixed exception on changing tag configuration Component: Setup Level: 1 Class: Bug fix Version: 2.1.0i1 Changing the tag configuration via the Web API triggered an error <tt>The following tags are still used but are not listed in the updated configuration: test:None</tt>. when a taggroup with just one toggleable option was explicitly not set on hosts.