Ensure that Konacha.getEvents always returns an Array

This was prompted by #98 but is probably a good idea in any case.

I suspect that this allows us to remove the `sleep 0.1` in `runner.rb`. @joliss, do you remember why this was added? It first appeared in 4a73478 as `sleep 0.2` and was decreased to `0.1` in d0f709f.