minor fix to run_tests
minor fix to run_tests


Former-commit-id: 85aa14c6760ab21ceb9446fc5c8e2848e24ebb19 [formerly 85aa14c6760ab21ceb9446fc5c8e2848e24ebb19 [formerly e9bc85211d2a58dbac312c76dde10d0cb6a9a640]]
Former-commit-id: 980fc69e7a8b1ea7bfa2d0d647f5a1b874611d06
Former-commit-id: 53db51850f75c75a3ddf3b825b05c7f8eed4f188
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine