Make sure WAL is synced for DB::Write() if write batch is empty
Summary: This patch makes it a contract that if an empty write batch is passed to DB::Write() and WriteOptions.sync = true, fsync is called to WAL. Test Plan: A new unit test Reviewers: ljin, rven, yhchiang, igor Reviewed By: igor Subscribers: dhruba, MarkCallaghan, leveldb Differential Revision: https://reviews.facebook.net/D28365
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