fix dataset generation append before creation
fix dataset generation append before creation


Former-commit-id: 824d8364fa725a5561fe82e5d4d21678dc00612c [formerly 1c72e733ba0bc5478d4918c9d84be97668c32439] [formerly ff0161a87d12cb1fcfdb1963f087bccc951f559e]
Former-commit-id: fa58d8312467fbf72e1b7b3e2188242c0a278876
Former-commit-id: 962838c592cd2e49240e8acd99025356a287ec25
dssg/wikienergy,dssg/wikienergy,dssg/wikienergy,dssg/wikienergy,dssg/wikienergy