Fixed num_sites in source_info [skip CI]
Fixed num_sites in source_info [skip CI]


Former-commit-id: 6a334b8b918112db0ff7086b71359fe43b17e469 [formerly 6a334b8b918112db0ff7086b71359fe43b17e469 [formerly c0e3ddc50eb15328b072bf3ba648598695080228]]
Former-commit-id: a19e22fdabd41f00983333a89ba84ca3f295630f
Former-commit-id: 2f8e8523b3905e3d39758ebfd95101fa6a2cc4ca
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine