It seams Stylus Hash implementation that we use here expects at least 2 items to exist. Ex.
This works
```
get(key)
    return pair[1] if pair[0] == key for pair in ('a' 1) ('b' 2)
get('a')
```

This fails to compile:
```
get(key)
    return pair[1] if pair[0] == key for pair in ('a' 1)
get('a')
```
I'm adding empty pair to avoid this.