Propagate connect failures et al. upwards to avoid crashing later with a nullref in Http.ExtractResponseData

Author: sdahlbac

RestSharp/Http.Async.cs

@@ -266,11 +266,13 @@ private static void GetRawResponseAsync(IAsyncResult result, Action<HttpWebRespo
 				if(ex.Status == WebExceptionStatus.RequestCanceled)
 				{
 					throw ex;
-				}
-				
+				}			
 				if (ex.Response is HttpWebResponse)
 				{
 					raw = ex.Response as HttpWebResponse;
+				} else
+				{
+					throw ex;
 				}
 			}
 
@@ -304,7 +306,15 @@ private void ResponseCallback(IAsyncResult result, Action<HttpResponse> callback
 					response.ResponseStatus = ResponseStatus.Aborted;
 					ExecuteCallback(response, callback);
 					return;
+				} else
+				{
+					response.ErrorMessage = ex.Message;
+					response.ErrorException = ex;
+					response.ResponseStatus = ResponseStatus.Error;
+					ExecuteCallback(response, callback);
+					return;
 				}
+
 			}
 			catch(Exception ex)
 			{