fix nonetype bug in appliance generation
fix nonetype bug in appliance generation


Former-commit-id: a9d9ad472ea1d8f762d53f29d4ce55fc514ddbf9
Former-commit-id: e55841523248f210eea6444c932e0928373ee5a4
dssg/wikienergy,dssg/wikienergy,dssg/wikienergy,dssg/wikienergy,dssg/wikienergy