Cleaned up websocket exceptions

src/Discord.Net/Net/WebSockets/WS4NetEngine.cs

@@ -83,7 +83,13 @@ namespace Discord.Net.WebSockets
         {
             Exception ex;
             if (e is ClosedEventArgs)
-                ex = new Exception($"Received close code {(e as ClosedEventArgs).Code}: {(e as ClosedEventArgs).Reason ?? "No reason"}");
+            {
+                int code = (e as ClosedEventArgs).Code;
+                string reason = (e as ClosedEventArgs).Reason;
+                if (String.IsNullOrEmpty(reason))
+                    reason = "No reason";
+                ex = new Exception($"Received close code {code}: {reason}");
+            }
             else
                 ex = new Exception($"Connection lost");
             _taskManager.SignalError(ex, isUnexpected: true);