Improved Close Message description

src/Discord.Net/Net/WebSockets/WebSocket.BuiltIn.cs

@@ -85,7 +85,8 @@ namespace Discord.Net.WebSockets
 							}
 
 							if (result.MessageType == WebSocketMessageType.Close)
-								throw new Exception($"Got Close Message ({result.CloseStatus?.ToString() ?? "Unexpected"}): {result.CloseStatusDescription ?? "No Reason"}");
+								throw new Exception($"Got Close Message ({result.CloseStatus?.ToString() ?? "Unexpected"}): " +
+								result.CloseStatusDescription != "" ? result.CloseStatusDescription : "No Reason");
 							else
 								builder.Append(Encoding.UTF8.GetString(buffer.Array, buffer.Offset, result.Count));