tests/risk_unittest: added test for RiskJobMixin.asset_bcr_per_site()
tests/risk_unittest: added test for RiskJobMixin.asset_bcr_per_site()


Former-commit-id: e9c9155db571f99f5034db257221a472f334ff15 [formerly 767ba36e12eca6e88e1362fbde0df7572db325a2]
Former-commit-id: ed929e90d995d639adf1ac3c80e24c1d48c27569
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine