intridea/omniauth — pull request #672 by nashbridges (2013-03-14 17:09:07+00:00)
Title: Block in Strategy.configure can return nil

In situations like this:

```ruby
class MyStrategy
include OmniAuth::Strategy
configure do |c|
c.baz = 123
c.foo = ENV['BAR']
end
end
```
the last assignment can return nil. This raises an error with unhelpful message `NoMethodError: undefined method 'each_pair' for nil:NilClass`