BulkInserter.flush does nothing if no values were inserted
BulkInserter.flush does nothing if no values were inserted


Former-commit-id: 8e5a81ff83447d40cd2f6a7feb4e46eb80b1e8eb [formerly 349ae48a43227f24b59e94e74c5e7c93121426a8]
Former-commit-id: 4a1981eac6f9107abdae27e637a9011869b00c1c
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine