Try to fix db problem

DO NOT MERGE YET

Try to fix problem:

    File "/home/pouwelse/GIT-pulls/anonymous-streaming-Chris.new/Tribler/dispersy/dispersy.py",
line 955, in _check_full_sync_distribution_batch
        assert last_seq or 0 == count, [last_seq, count]
    exceptions.AssertionError: [None, 9]