Traceback (most recent call last):
  ...
  File "neo/storage/handlers/storage.py", line 111, in answerFetchObjects
    self.app.replicator.finish()
  File "neo/storage/replicator.py", line 370, in finish
    self._nextPartition()
  File "neo/storage/replicator.py", line 279, in _nextPartition
    assert app.pt.getCell(offset, app.uuid).isOutOfDate()
AssertionError

The scenario is:
1. partition A: start of replication, with unfinished transactions
2. partition A: all unfinished transactions are finished
3. partition A: end of replication with ReplicationDone notification
4. replication of partition B
5. partition A: AssertionError when starting replication

The bug is that in 3, the partition A is partially replicated and the storage
node must not notify the master.