GetAllBucketsAsync always throws ArgumentNullException

Summary: GetAllBucketsAsync always throws a "Value cannot be null" exception.

Repro: See code sample:

using System;
using System.Threading.Tasks;
using Couchbase;

namespace DeleteMe
{
class Program
{
static async Task Main(string[] args)
{
var cluster = await Cluster.ConnectAsync("couchbase://localhost", "Administrator", "password");

var buckets = await cluster.Buckets.GetAllBucketsAsync();

foreach (var bucket in buckets)

await cluster.DisposeAsync();
}
}
}

Expected: I have 3 buckets running in the cluster, it should return information about them.

Actual: Exception. See stack trace:

Unhandled exception. System.ArgumentNullException: Value cannot be null. (Parameter 'value')
at Newtonsoft.Json.Utilities.ValidationUtils.ArgumentNotNull(Object value, String parameterName)
at Newtonsoft.Json.Linq.Extensions.Value[T,U](IEnumerable`1 value)
at Newtonsoft.Json.Linq.Extensions.Value[U](IEnumerable`1 value)
at Couchbase.Management.Buckets.BucketManager.GetBucketSettings(JToken json)
at Couchbase.Management.Buckets.BucketManager.GetAllBucketsAsync(GetAllBucketsOptions options)
at DeleteMe.Program.Main(String[] args) in C:\zproj\DeleteMe\DeleteMe\Program.cs:line 13
at DeleteMe.Program.<Main>(String[] args)

C:\zproj\DeleteMe\DeleteMe\bin\Debug\netcoreapp3.1\DeleteMe.exe (process 31576) exited with code -532462766.
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