Factored out in grid_assets the iteration over the asset of a grid
Factored out in grid_assets the iteration over the asset of a grid


Former-commit-id: a034dbd7b4a5dd24014ebba66de11ced31f3eb3a
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine