katalyst/koi — pull request #40 by haydn (2013-01-14 06:54:55+00:00)
Title: Improve Partial Lookup Performance

Instead of doing this:

```ruby
begin
render "whatever"
rescue ActionView::MissingTemplate
# do whatever
end
```

We can do this:

```ruby
if lookup_context.template_exists?("whatever", [], true)
render "whatever"
else
# do whatever
end
```