Fixed the filtering of MultiPointSources [skip hazardlib]
Fixed the filtering of MultiPointSources [skip hazardlib]


Former-commit-id: 1f4c6fc7be5540c82d8230130aa2e81d87f5f9f9
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine