Fix hdf5new for empty datadir [skip CI]
Fix hdf5new for empty datadir [skip CI]


Former-commit-id: bfa4165c49b3237877b94fcc994977282c044b01 [formerly b350285af5ba00487c106b4f5726ce7373d54860]
Former-commit-id: 4b1443d41f4bcd3b01f8f78fc632c8816e599915
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine