Store only non-empty gmf_data/sid
Store only non-empty gmf_data/sid


Former-commit-id: 171f5da95044ca6a17b009010323acb7d754e63f [formerly 0e6394d8bda1d35fe1ad9121d086911da174952a]
Former-commit-id: 03b9c485240079e9cf772538b0addd167133fc63
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine