Improved the traceback returned by safely_call
Improved the traceback returned by safely_call


Former-commit-id: 72151315317ff4dd71c990e63ea06fe306c010b3 [formerly 72151315317ff4dd71c990e63ea06fe306c010b3 [formerly 13ec252eb056b9178eca6bcc3450514e71a274fe]]
Former-commit-id: 965482146592ea5ac7cbd62b79813a7dace94349
Former-commit-id: a42c615d47a360599641e391c231c226cbab1605
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine