neo4j/neo4j — pull request #3677 by tinwelint (2014-12-15 20:18:29+00:00)
Title: Store migrator sets base tx checksum if migrating empty store

since there's this convention that txId=BASE_TX_ID has checksum
BASE_TX_CHECKSUM. This logic exists in some places and StoreMigrator
now follows that convention as well to avoid checksum mismatches.