small fix to source model lt
small fix to source model lt


Former-commit-id: 54105815c4ae47fcd7f06f7d3e9cfb54e2ac5381 [formerly d4f9786662730a0a4e715a6b55a9dfb186bb6f73]
Former-commit-id: eda8aff76b8e488f6d47746cada9afc3f59b3c4d
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine