Division by zero adding SC counts for the final year of a game about dipvis

[UEWBot]

I think we hit the error because the first CentreCount added is for an eliminated power. Because the year is the final year for the game, we set the game to is_finished and save it. That means recalculating the scores for the game, which retrieves the centre counts for the final year from the db, most of which don't exist. The one that does exist is zero, giving a score of 0/0.

We actually don't want to recalculate the scores until we have the centre counts for all 7 powers saved to the database, which I think means setting the game to finished from the view code instead.

The same bug probably exists if somebody solos, and I suspect things wouldn't be correct if there were no eliminated powers, too, although we might not get an exception in that case).

[UEWBot]

Fixed by commit 6eabb82