Fix custom write checkpoints #280
Merged
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Fixes a regression from #276. The bug is not any release, so not adding a changeset.
#276 refactored custom write checkpoints to be flushed together with other changes when using MongoDB storage, to make it easy to associate an op_id with it. The bug is that if there were no other changes to flush, the write checkpoints weren't flushed either. This fixes it, and adds a test to reproduce.
This also adds a log message to indicate when custom write checkpoints are being flushed (but no details included yet).