Adding default value
Adding default value


Former-commit-id: 748e4976a11acadf57e975470f1e3babc50178c3 [formerly 1e54d91263e9ff1f1162fcfd27199acbe050c689]
Former-commit-id: 59471a20df5bfdefcc550ddcefc9d1c36f288a69
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine