Added an assert [skip CI]
Added an assert [skip CI]


Former-commit-id: d28969a55f543eb3975e3c693923db9e608fe638 [formerly d28969a55f543eb3975e3c693923db9e608fe638 [formerly 9c54b0c81c4d281474c2d49d492275c804741a6c]]
Former-commit-id: e8696f01dc3c23676faabf3381afba495447f106
Former-commit-id: 556617e593fc6fe353eca149164cf3e01f1c7c23
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine