Fixed the preclassical calculator to store the source weights [skip CI]
Fixed the preclassical calculator to store the source weights [skip CI]


Former-commit-id: 2c5a5116d0ed74628cc9b970991c2b05a34d7074 [formerly 2298de96f92769c086b762cbc11199e5a5a78500] [formerly 2298de96f92769c086b762cbc11199e5a5a78500 [formerly 3b1aa8866ebadc5577b6713d70f533e489661990]]
Former-commit-id: 7c4bc546e360752a88204c9e299828d57f110f5c
Former-commit-id: 73081185a1885d9f8f74f22d15a4a5ec5b05da11
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine