Tidier warnings if there is no upstream_meter. #266
Tidier warnings if there is no upstream_meter. #266

pauldeng/nilmtk,nilmtk/nilmtk,nilmtk/nilmtk,HarllanAndrye/nilmtk,jaduimstra/nilmtk,mmottahedi/nilmtk,AlexRobson/nilmtk,josemao/nilmtk