Fix setSettingsAttribute for null values (#4981)
Fix setSettingsAttribute for null values (#4981)

* Fix setSettingsAttribute for null values

* Fix json encode for setSettingsAttribute

Co-authored-by: Christoph Schweppe <59bd0a3ff43b32849b319e645d4798d8a5d1e889@cschweppe.de>
the-control-group/voyager,the-control-group/voyager