behavior does not init properly when parameters are "optional"

I'm using Hyperscript 0.9.12 and attempting to do something similar to what the [Draggable](https://gist.github.com/dz4k/6505fb82ae7fdb0a03e6f3e360931aa9) example does. Default to "me" if a specific click target is not passed in.

The init block does not work.

```

behavior alertMe(clickElement)
init
if no clickElement set the clickElement to me
end

on click from clickElement
call alert('behavior is working!')
end
end

click me

click me
```