Avoid KeyError in event_based_risk [skip hazardlib][demos]
Avoid KeyError in event_based_risk [skip hazardlib][demos]


Former-commit-id: 644c1689e45ec037ebe128e90cae7251d15e4855
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine