Fixed oq plot [skip hazardlib][demos]
Fixed oq plot [skip hazardlib][demos]


Former-commit-id: 68e8d413597d9da06e3f33f1b39b0a65ae772ddc [formerly 8a2e2eb59e473869468c182ea4a29442f57d73b2]
Former-commit-id: d1e5f9f11f94651bd684ee0c223f182cfbfe4d99
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine