[new downloader] CountryTree::Clear() bugfix.
[new downloader] CountryTree::Clear() bugfix.

mpimenov/omim,dobriy-eeh/omim,VladiMihaylenko/omim,mgsergio/omim,65apps/omim,goblinr/omim,goblinr/omim,gardster/omim,syershov/omim,syershov/omim,milchakov/omim,gardster/omim,ygorshenin/omim,syershov/omim,trashkalmar/omim,simon247/omim,milchakov/omim,rokuz/omim,stangls/omim,ygorshenin/omim,mapsme/omim,mapsme/omim,syershov/omim,darina/omim,VladiMihaylenko/omim,darina/omim,alexzatsepin/omim,Transtech/omim,stangls/omim,alexzatsepin/omim,alexzatsepin/omim,rokuz/omim,yunikkk/omim,darina/omim,darina/omim,VladiMihaylenko/omim,matsprea/omim,mapsme/omim,yunikkk/omim,65apps/omim,gardster/omim,syershov/omim,bykoianko/omim,bykoianko/omim,darina/omim,Transtech/omim,stangls/omim,gardster/omim,VladiMihaylenko/omim,stangls/omim,milchakov/omim,mgsergio/omim,Transtech/omim,65apps/omim,matsprea/omim,yunikkk/omim,milchakov/omim,dobriy-eeh/omim,stangls/omim,goblinr/omim,Transtech/omim,gardster/omim,simon247/omim,Transtech/omim,mpimenov/omim,rokuz/omim,VladiMihaylenko/omim,Transtech/omim,trashkalmar/omim,trashkalmar/omim,VladiMihaylenko/omim,milchakov/omim,darina/omim,bykoianko/omim,simon247/omim,mapsme/omim,rokuz/omim,yunikkk/omim,darina/omim,bykoianko/omim,ygorshenin/omim,syershov/omim,rokuz/omim,darina/omim,dobriy-eeh/omim,bykoianko/omim,mapsme/omim,rokuz/omim,goblinr/omim,milchakov/omim,65apps/omim,dobriy-eeh/omim,milchakov/omim,bykoianko/omim,alexzatsepin/omim,mpimenov/omim,gardster/omim,syershov/omim,alexzatsepin/omim,ygorshenin/omim,bykoianko/omim,mgsergio/omim,goblinr/omim,65apps/omim,mpimenov/omim,simon247/omim,trashkalmar/omim,dobriy-eeh/omim,Transtech/omim,simon247/omim,rokuz/omim,65apps/omim,VladiMihaylenko/omim,trashkalmar/omim,syershov/omim,mgsergio/omim,Zverik/omim,mapsme/omim,Zverik/omim,goblinr/omim,rokuz/omim,trashkalmar/omim,Zverik/omim,trashkalmar/omim,bykoianko/omim,mgsergio/omim,milchakov/omim,VladiMihaylenko/omim,dobriy-eeh/omim,darina/omim,mapsme/omim,stangls/omim,dobriy-eeh/omim,rokuz/omim,gardster/omim,matsprea/omim,goblinr/omim,gardster/omim,ygorshenin/omim,matsprea/omim,Transtech/omim,simon247/omim,mpimenov/omim,alexzatsepin/omim,ygorshenin/omim,syershov/omim,65apps/omim,rokuz/omim,syershov/omim,stangls/omim,mgsergio/omim,ygorshenin/omim,alexzatsepin/omim,matsprea/omim,matsprea/omim,Zverik/omim,Transtech/omim,mgsergio/omim,Zverik/omim,Zverik/omim,VladiMihaylenko/omim,mapsme/omim,matsprea/omim,mgsergio/omim,milchakov/omim,mgsergio/omim,matsprea/omim,trashkalmar/omim,stangls/omim,mgsergio/omim,mgsergio/omim,bykoianko/omim,yunikkk/omim,alexzatsepin/omim,mpimenov/omim,trashkalmar/omim,mpimenov/omim,stangls/omim,ygorshenin/omim,bykoianko/omim,Transtech/omim,milchakov/omim,mpimenov/omim,VladiMihaylenko/omim,VladiMihaylenko/omim,ygorshenin/omim,alexzatsepin/omim,mpimenov/omim,gardster/omim,trashkalmar/omim,65apps/omim,yunikkk/omim,Zverik/omim,goblinr/omim,dobriy-eeh/omim,milchakov/omim,Transtech/omim,alexzatsepin/omim,Zverik/omim,gardster/omim,ygorshenin/omim,simon247/omim,Zverik/omim,bykoianko/omim,VladiMihaylenko/omim,dobriy-eeh/omim,matsprea/omim,65apps/omim,mpimenov/omim,goblinr/omim,milchakov/omim,darina/omim,yunikkk/omim,rokuz/omim,mpimenov/omim,65apps/omim,goblinr/omim,rokuz/omim,alexzatsepin/omim,yunikkk/omim,mapsme/omim,darina/omim,trashkalmar/omim,rokuz/omim,simon247/omim,darina/omim,mapsme/omim,matsprea/omim,goblinr/omim,Transtech/omim,milchakov/omim,alexzatsepin/omim,ygorshenin/omim,VladiMihaylenko/omim,mapsme/omim,Zverik/omim,stangls/omim,goblinr/omim,mpimenov/omim,yunikkk/omim,yunikkk/omim,dobriy-eeh/omim,Zverik/omim,simon247/omim,trashkalmar/omim,syershov/omim,stangls/omim,syershov/omim,dobriy-eeh/omim,yunikkk/omim,65apps/omim,mapsme/omim,mgsergio/omim,mapsme/omim,bykoianko/omim,dobriy-eeh/omim,dobriy-eeh/omim,syershov/omim,alexzatsepin/omim,ygorshenin/omim,bykoianko/omim,goblinr/omim,Zverik/omim,simon247/omim,darina/omim,mpimenov/omim,Zverik/omim