Short-circuit the computation if there are no POEs defined.
Short-circuit the computation if there are no POEs defined.


Former-commit-id: c03fa9042a881c9f2497a378720b238a2b789b95 [formerly 88942903b6664f01c9e3bf4583e604df23a5cd14] [formerly 88942903b6664f01c9e3bf4583e604df23a5cd14 [formerly 4398e17059a572f1217c6c560fe8776c41b70eb9]]
Former-commit-id: eb71c260edf9db525c974a48be0e4efd07d0a68f
Former-commit-id: e4512cd5b354107bfd2f64bb9a0054372d18ace1
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine