yet another bug fix in tijah-score: - we assure now that every node for which a score is asked   gets at least a zero score.
yet another bug fix in tijah-score:
- we assure now that every node for which a score is asked
  gets at least a zero score.

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb