Avoided reading the source model when not needed [skip hazardlib][demos]
Avoided reading the source model when not needed [skip hazardlib][demos]


Former-commit-id: d9a3319997673dbdd58051756628001537027693 [formerly 2b83d18ddbfca351467d7a3d1a33a1433e04602b]
Former-commit-id: ecbf9cb408d1f6e405948a68560faaa228220b53
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine