Arvoreniad/arcana — pull request #7 by JamesS237 (2014-02-01 22:33:15+00:00)
Title: fix overall_average

Whenever you went to the show student page with a new user, it would cause an error, because Redis has no keys! Therefore it was trying to divide `nil` by 0! This PR calls:
```ruby
self.recalculate_averages!
```
before sending the averages.