Added missing docstring
Added missing docstring


Former-commit-id: f3e9fbb5fda40e1f416b81b18fd4091f50050a97 [formerly 07750c646699cd1607524ffa40dae103bc9a10ed]
Former-commit-id: 5b05c8bbd7d58d959499f17a651d7f7c4c331740
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine