Add missing import (was provided by accident from openquake.output.hazard).
Add missing import (was provided by accident from openquake.output.hazard).


Former-commit-id: eba306acc0e132be50dc2514c9c9df6da3351c29 [formerly eba306acc0e132be50dc2514c9c9df6da3351c29 [formerly 2261d550195882e6aa44e4529e9d2279f2aba5dc]]
Former-commit-id: 5179c2f87b0a1eebcc2cf44444a5baad7c556ecb
Former-commit-id: b4137538e8eb21aeca5d3dd66a05fa40abd02c94
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine