Restored a warning message as an assertion
Restored a warning message as an assertion


Former-commit-id: 3e18fb2a7eafdc8ebfca0b0c2c3d826ee597a3e2 [formerly 939af3a902578ae658b67a8614b4a37da3e42ee9]
Former-commit-id: a5e65db3faf5f906a43c41628c83fdaa5a710214
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine