Add tests for some AFJSONRequestSerializer corner cases (empty data)
Add tests for some AFJSONRequestSerializer corner cases (empty data)

kiurentu/AFNetworking,FelixYin66/AFNetworking,maximmalygin/AFNetworking,Juraldinio/AFNetworking,knutigro/AFNetworking,nonoBruce/AFNetworking,AFNetworking/AFNetworking,michal-olszewski/AFNetworking-CustomCallbacks,Kjuly/AFNetworking,opentable/AFNetworking,smule/AFNetworking,renaudbuisine/MF_AFNetworking,RbBtSn0w/AFNetworking,zhang-yawei/AFNetworking,Fitbit/AFNetworking,wprice/AFNetworking,knutigro/AFNetworking,opentable/AFNetworking,E-B-Smith/AFNetworking,Kjuly/AFNetworking,p4checo/AFNetworking,wprice/AFNetworking,adozenlines/AFNetworking,Automatic/AFNetworking,yuewenyan/AFNetworking,wymsee/AFNetworking,Automatic/AFNetworking,SecuraSeal/AFNetworking,renaudbuisine/MF_AFNetworking,rocklive/AFNetworking,kiurentu/AFNetworking,guogh/AFNetworking,maximmalygin/AFNetworking,wymsee/AFNetworking,AFNetworking/AFNetworking,Yincongxiao/AFNetworking,houweilei/AFNetworking,nonoBruce/AFNetworking,E-B-Smith/AFNetworking,Fitbit/AFNetworking,Farteen/AFNetworking,houweilei/AFNetworking,opentable/AFNetworking,yuewenyan/AFNetworking,sunkehappy/AFNetworking,yunzhongyoulong/AFNetworking,wangxiaoxiang/AFNetworking,p4checo/AFNetworking,Juraldinio/AFNetworking,Kjuly/AFNetworking,iKorich/AFNetworking,mhpavl/AFNetworking,SecuraSeal/AFNetworking,rocklive/AFNetworking,0xced/AFNetworking,0xced/AFNetworking,adozenlines/AFNetworking,AFNetworking/AFNetworking,yunzhongyoulong/AFNetworking,zhang-yawei/AFNetworking,Yincongxiao/AFNetworking,michal-olszewski/AFNetworking-CustomCallbacks,Farteen/AFNetworking,RbBtSn0w/AFNetworking,mhpavl/AFNetworking,E-B-Smith/AFNetworking,smule/AFNetworking,guogh/AFNetworking,nonoBruce/AFNetworking