When you ask for a column that does not exist in your Livestatus version, now this is not
considered as a fatal error any longer but just being logged as a warning. Instead
an empty string (CSV), None (Python) or null (JSON) is being returned.
This makes it easier for GUIs to maintain compatibility with existing Livestatus version
when new features are implemented that make use of new Livestatus columns.
To the list of all Werks