Reporting organisation select shows no organisations

[andylolz]

I.e.:

This appears related to recent updates to the IATI registry API. Specifically, I suspect the registry may have begun serving gzipped content where it previously didn’t? If so, I think there’s a problem when running helpers/refresh_group_data.example.php. Namely, I think cURL will only automatically unzip received content if CURLOPT_ENCODING is set, rather than the accept-encoding header.