Bookmarks: do not crash while changing visibility of folders
Bookmarks: do not crash while changing visibility of folders

BUG: 317794

AndreiDuma/marble,adraghici/marble,adraghici/marble,oberluz/marble,tzapzoor/marble,quannt24/marble,adraghici/marble,tzapzoor/marble,oberluz/marble,quannt24/marble,tucnak/marble,David-Gil/marble-dev,Earthwings/marble,utkuaydin/marble,David-Gil/marble-dev,oberluz/marble,probonopd/marble,Earthwings/marble,oberluz/marble,David-Gil/marble-dev,tucnak/marble,utkuaydin/marble,tzapzoor/marble,quannt24/marble,AndreiDuma/marble,tucnak/marble,probonopd/marble,tzapzoor/marble,rku/marble,David-Gil/marble-dev,AndreiDuma/marble,utkuaydin/marble,AndreiDuma/marble,utkuaydin/marble,tucnak/marble,quannt24/marble,Earthwings/marble,rku/marble,rku/marble,quannt24/marble,Earthwings/marble,utkuaydin/marble,rku/marble,oberluz/marble,rku/marble,quannt24/marble,probonopd/marble,tucnak/marble,tucnak/marble,rku/marble,adraghici/marble,David-Gil/marble-dev,probonopd/marble,probonopd/marble,Earthwings/marble,probonopd/marble,AndreiDuma/marble,tzapzoor/marble,Earthwings/marble,tzapzoor/marble,tucnak/marble,quannt24/marble,tzapzoor/marble,AndreiDuma/marble,probonopd/marble,David-Gil/marble-dev,oberluz/marble,adraghici/marble,tzapzoor/marble,utkuaydin/marble,adraghici/marble