Null check bug fixes

Author: stevejgordon

src/Elastic.Transport/Responses/DefaultResponseFactory.cs

@@ -79,13 +79,11 @@ private async ValueTask<TResponse> CreateCoreAsync<TResponse>(
 		IReadOnlyDictionary<TcpState, int>? tcpStats,
 		CancellationToken cancellationToken = default) where TResponse : TransportResponse, new()
 	{
-		responseStream.ThrowIfNull(nameof(responseStream));
-
 		var details = InitializeApiCallDetails(endpoint, boundConfiguration, postData, ex, statusCode, headers, contentType, threadPoolStats, tcpStats, contentLength);
 
 		TResponse? response = null;
 
-		if (MayHaveBody(statusCode, endpoint.Method, contentLength)
+		if (responseStream is not null && MayHaveBody(statusCode, endpoint.Method, contentLength)
 			&& TryResolveBuilder<TResponse>(boundConfiguration.ResponseBuilders, boundConfiguration.ProductResponseBuilders, out var builder))
 		{
 			var ownsStream = false;

src/Elastic.Transport/Responses/Special/StreamResponse.cs

@@ -53,7 +53,7 @@ protected virtual void Dispose(bool disposing)
 				if (LinkedDisposables is not null)
 				{
 					foreach (var disposable in LinkedDisposables)
-						disposable.Dispose();
+						disposable?.Dispose();
 				}
 			}