- The `API_MAX_PAGES` value is 50, so for pages 1 to 50, the
`paginate_rest` method was making an API call even if there was no
data past, for example, page 8.
- This made `brew contributions --user=issyl0` take 11 minutes, since we
made 50 API calls _per repo_ even if it was unnecessary, burning down
our API allowance.
- Instead, stop looping if we detect that there's no data in `result`.
- This probably needs more testing for other parts of Homebrew that rely
on `paginate_rest` and the different shapes of data it outputs.
dd140ea717