http-client, callback calls cause TypeError

[Perdjesk]

Following functions in http-client.js are likely to throw an exception when an error occured in underlying call of httpClient.request:

• HttpClient.prototype.buckets
• HttpClient.prototype.getBucket

Because when an error is detected in httpClient.request the callback is called as following:

 callback(err);

and in those two functions, callbacks are implemented as:

meta.callback = function(err, data, _meta) { callback(err, data.buckets, _meta) }

Something like the following could be added in callback:

data = data ? data.buckets : undefined;
callback(err, data, _meta);

Exact error is:
TypeError: Cannot read property 'buckets' of undefined