Spree::Zone#country_list fix
Spree::Zone#country_list fix

Just fixing wrong default value of case expression - should return an Array instance, ie. `[]` instead of `nil`.

Fixes #4827

ujai/spree,Engeltj/spree,CiscoCloud/spree,zamiang/spree,assembledbrands/spree,volpejoaquin/spree,gregoryrikson/spree-sample,keatonrow/spree,joanblake/spree,zamiang/spree,jeffboulet/spree,lyzxsc/spree,Kagetsuki/spree,nooysters/spree,volpejoaquin/spree,vmatekole/spree,madetech/spree,derekluo/spree,Hawaiideveloper/shoppingcart,fahidnasir/spree,patdec/spree,kewaunited/spree,reidblomquist/spree,useiichi/spree,surfdome/spree,rajeevriitm/spree,alvinjean/spree,derekluo/spree,vulk/spree,karlitxo/spree,builtbybuffalo/spree,PhoenixTeam/spree_phoenix,wolfieorama/spree,PhoenixTeam/spree_phoenix,lyzxsc/spree,ckk-scratch/solidus,azranel/spree,zaeznet/spree,raow/spree,piousbox/spree,KMikhaylovCTG/spree,grzlus/spree,scottcrawford03/solidus,yiqing95/spree,camelmasa/spree,ramkumar-kr/spree,sliaquat/spree,DynamoMTL/spree,tomash/spree,vcavallo/spree,APohio/spree,rajeevriitm/spree,nooysters/spree,Ropeney/spree,net2b/spree,pervino/solidus,DarkoP/spree,locomotivapro/spree,berkes/spree,JDutil/spree,reinaris/spree,CJMrozek/spree,jparr/spree,archSeer/spree,rbngzlv/spree,gregoryrikson/spree-sample,reinaris/spree,TrialGuides/spree,caiqinghua/spree,DarkoP/spree,ayb/spree,njerrywerry/spree,piousbox/spree,softr8/spree,ckk-scratch/solidus,berkes/spree,trigrass2/spree,welitonfreitas/spree,jeffboulet/spree,dafontaine/spree,vmatekole/spree,volpejoaquin/spree,cutefrank/spree,CiscoCloud/spree,quentinuys/spree,locomotivapro/spree,vinsol/spree,sliaquat/spree,lsirivong/spree,mleglise/spree,sideci-sample/sideci-sample-spree,archSeer/spree,rbngzlv/spree,miyazawatomoka/spree,ayb/spree,thogg4/spree,Senjai/solidus,gregoryrikson/spree-sample,rajeevriitm/spree,omarsar/spree,degica/spree,dafontaine/spree,odk211/spree,jeffboulet/spree,pulkit21/spree,omarsar/spree,jspizziri/spree,TimurTarasenko/spree,richardnuno/solidus,vinayvinsol/spree,radarseesradar/spree,imella/spree,DarkoP/spree,sliaquat/spree,AgilTec/spree,lsirivong/solidus,tesserakt/clean_spree,builtbybuffalo/spree,pulkit21/spree,PhoenixTeam/spree_phoenix,azclick/spree,project-eutopia/spree,KMikhaylovCTG/spree,athal7/solidus,ahmetabdi/spree,moneyspyder/spree,raow/spree,tomash/spree,grzlus/solidus,jordan-brough/solidus,tomash/spree,scottcrawford03/solidus,jparr/spree,CiscoCloud/spree,adaddeo/spree,rbngzlv/spree,shaywood2/spree,NerdsvilleCEO/spree,ujai/spree,sfcgeorge/spree,degica/spree,priyank-gupta/spree,athal7/solidus,TimurTarasenko/spree,lsirivong/solidus,zaeznet/spree,degica/spree,Kagetsuki/spree,pervino/spree,Engeltj/spree,jimblesm/spree,derekluo/spree,jsurdilla/solidus,pervino/spree,delphsoft/spree-store-ballchair,abhishekjain16/spree,DynamoMTL/spree,fahidnasir/spree,project-eutopia/spree,adaddeo/spree,rajeevriitm/spree,azranel/spree,jasonfb/spree,volpejoaquin/spree,Lostmyname/spree,abhishekjain16/spree,siddharth28/spree,patdec/spree,useiichi/spree,Senjai/solidus,berkes/spree,yushine/spree,joanblake/spree,lsirivong/spree,tancnle/spree,camelmasa/spree,Kagetsuki/spree,pervino/solidus,mleglise/spree,jspizziri/spree,TimurTarasenko/spree,reidblomquist/spree,fahidnasir/spree,adaddeo/spree,rakibulislam/spree,joanblake/spree,vinsol/spree,lyzxsc/spree,miyazawatomoka/spree,karlitxo/spree,assembledbrands/spree,tesserakt/clean_spree,APohio/spree,mleglise/spree,bonobos/solidus,cutefrank/spree,yushine/spree,trigrass2/spree,builtbybuffalo/spree,jasonfb/spree,alvinjean/spree,hoanghiep90/spree,piousbox/spree,Hawaiideveloper/shoppingcart,locomotivapro/spree,quentinuys/spree,beni55/spree,vmatekole/spree,gautamsawhney/spree,CJMrozek/spree,beni55/spree,Migweld/spree,shaywood2/spree,Migweld/spree,progsri/spree,rakibulislam/spree,Arpsara/solidus,jimblesm/spree,robodisco/spree,Senjai/solidus,FadliKun/spree,jaspreet21anand/spree,alvinjean/spree,abhishekjain16/spree,bricesanchez/spree,jasonfb/spree,sliaquat/spree,FadliKun/spree,DarkoP/spree,raow/spree,imella/spree,njerrywerry/spree,welitonfreitas/spree,robodisco/spree,Arpsara/solidus,patdec/spree,rakibulislam/spree,Engeltj/spree,archSeer/spree,mindvolt/spree,progsri/spree,hoanghiep90/spree,AgilTec/spree,camelmasa/spree,JDutil/spree,mindvolt/spree,Arpsara/solidus,SadTreeFriends/spree,forkata/solidus,jspizziri/spree,dafontaine/spree,Hawaiideveloper/shoppingcart,orenf/spree,zaeznet/spree,SadTreeFriends/spree,sunny2601/spree,delphsoft/spree-store-ballchair,tomash/spree,bonobos/solidus,alvinjean/spree,sideci-sample/sideci-sample-spree,orenf/spree,agient/agientstorefront,radarseesradar/spree,ujai/spree,tancnle/spree,lsirivong/spree,priyank-gupta/spree,JuandGirald/spree,APohio/spree,vcavallo/spree,edgward/spree,NerdsvilleCEO/spree,richardnuno/solidus,FadliKun/spree,sunny2601/spree,carlesjove/spree,jsurdilla/solidus,dandanwei/spree,scottcrawford03/solidus,grzlus/solidus,nooysters/spree,JuandGirald/spree,bricesanchez/spree,keatonrow/spree,ayb/spree,mleglise/spree,wolfieorama/spree,Senjai/solidus,yushine/spree,shekibobo/spree,hoanghiep90/spree,Engeltj/spree,firman/spree,zamiang/spree,hifly/spree,calvinl/spree,ramkumar-kr/spree,thogg4/spree,welitonfreitas/spree,delphsoft/spree-store-ballchair,wolfieorama/spree,omarsar/spree,grzlus/solidus,softr8/spree,xuewenfei/solidus,gautamsawhney/spree,mindvolt/spree,vinayvinsol/spree,bonobos/solidus,keatonrow/spree,net2b/spree,softr8/spree,siddharth28/spree,quentinuys/spree,ahmetabdi/spree,azclick/spree,brchristian/spree,jsurdilla/solidus,grzlus/spree,vinsol/spree,AgilTec/spree,jasonfb/spree,richardnuno/solidus,jaspreet21anand/spree,progsri/spree,imella/spree,devilcoders/solidus,sfcgeorge/spree,reinaris/spree,patdec/spree,carlesjove/spree,trigrass2/spree,fahidnasir/spree,firman/spree,vmatekole/spree,vulk/spree,JuandGirald/spree,TrialGuides/spree,Ropeney/spree,robodisco/spree,karlitxo/spree,devilcoders/solidus,jeffboulet/spree,jordan-brough/solidus,ahmetabdi/spree,gautamsawhney/spree,lsirivong/solidus,shaywood2/spree,hifly/spree,jimblesm/spree,Boomkat/spree,odk211/spree,richardnuno/solidus,alejandromangione/spree,Boomkat/spree,caiqinghua/spree,DynamoMTL/spree,zaeznet/spree,jspizziri/spree,joanblake/spree,groundctrl/spree,bricesanchez/spree,vcavallo/spree,welitonfreitas/spree,calvinl/spree,ckk-scratch/solidus,useiichi/spree,scottcrawford03/solidus,tesserakt/clean_spree,sunny2601/spree,wolfieorama/spree,robodisco/spree,agient/agientstorefront,jparr/spree,alejandromangione/spree,gregoryrikson/spree-sample,zamiang/spree,cutefrank/spree,project-eutopia/spree,moneyspyder/spree,brchristian/spree,agient/agientstorefront,NerdsvilleCEO/spree,grzlus/spree,brchristian/spree,vcavallo/spree,keatonrow/spree,PhoenixTeam/spree_phoenix,Boomkat/spree,mindvolt/spree,project-eutopia/spree,Machpowersystems/spree_mach,priyank-gupta/spree,TimurTarasenko/spree,alejandromangione/spree,radarseesradar/spree,kewaunited/spree,njerrywerry/spree,net2b/spree,thogg4/spree,devilcoders/solidus,odk211/spree,surfdome/spree,sideci-sample/sideci-sample-spree,forkata/solidus,Arpsara/solidus,yushine/spree,adaddeo/spree,reinaris/spree,njerrywerry/spree,azranel/spree,JDutil/spree,sfcgeorge/spree,APohio/spree,pervino/spree,rakibulislam/spree,surfdome/spree,Kagetsuki/spree,groundctrl/spree,trigrass2/spree,raow/spree,vinayvinsol/spree,agient/agientstorefront,brchristian/spree,caiqinghua/spree,madetech/spree,jaspreet21anand/spree,orenf/spree,NerdsvilleCEO/spree,beni55/spree,hoanghiep90/spree,quentinuys/spree,Migweld/spree,forkata/solidus,athal7/solidus,edgward/spree,miyazawatomoka/spree,yiqing95/spree,CJMrozek/spree,alejandromangione/spree,omarsar/spree,jimblesm/spree,piousbox/spree,locomotivapro/spree,shekibobo/spree,delphsoft/spree-store-ballchair,shekibobo/spree,bonobos/solidus,reidblomquist/spree,jaspreet21anand/spree,Migweld/spree,Ropeney/spree,CJMrozek/spree,net2b/spree,JDutil/spree,jordan-brough/solidus,azclick/spree,orenf/spree,nooysters/spree,vinsol/spree,lsirivong/spree,pulkit21/spree,SadTreeFriends/spree,pulkit21/spree,sfcgeorge/spree,Hawaiideveloper/shoppingcart,thogg4/spree,hifly/spree,carlesjove/spree,maybii/spree,groundctrl/spree,berkes/spree,Lostmyname/spree,jordan-brough/solidus,ckk-scratch/solidus,tancnle/spree,cutefrank/spree,calvinl/spree,derekluo/spree,shekibobo/spree,FadliKun/spree,firman/spree,Lostmyname/spree,vinayvinsol/spree,pervino/spree,pervino/solidus,dafontaine/spree,DynamoMTL/spree,Lostmyname/spree,AgilTec/spree,shaywood2/spree,siddharth28/spree,kewaunited/spree,dandanwei/spree,azranel/spree,JuandGirald/spree,madetech/spree,devilcoders/solidus,KMikhaylovCTG/spree,Machpowersystems/spree_mach,gautamsawhney/spree,tesserakt/clean_spree,beni55/spree,Machpowersystems/spree_mach,builtbybuffalo/spree,athal7/solidus,maybii/spree,maybii/spree,ayb/spree,hifly/spree,surfdome/spree,SadTreeFriends/spree,calvinl/spree,odk211/spree,abhishekjain16/spree,KMikhaylovCTG/spree,siddharth28/spree,kewaunited/spree,useiichi/spree,dandanwei/spree,camelmasa/spree,grzlus/spree,softr8/spree,TrialGuides/spree,priyank-gupta/spree,pervino/solidus,assembledbrands/spree,ramkumar-kr/spree,moneyspyder/spree,grzlus/solidus,azclick/spree,karlitxo/spree,reidblomquist/spree,radarseesradar/spree,madetech/spree,progsri/spree,archSeer/spree,Ropeney/spree,forkata/solidus,lyzxsc/spree,Boomkat/spree,yiqing95/spree,vulk/spree,CiscoCloud/spree,ramkumar-kr/spree,xuewenfei/solidus,maybii/spree,xuewenfei/solidus,jsurdilla/solidus,firman/spree,tancnle/spree,sunny2601/spree,edgward/spree,yiqing95/spree,carlesjove/spree,moneyspyder/spree,ahmetabdi/spree,vulk/spree,xuewenfei/solidus,TrialGuides/spree,jparr/spree,rbngzlv/spree,dandanwei/spree,lsirivong/solidus,miyazawatomoka/spree,groundctrl/spree,caiqinghua/spree,edgward/spree