Setting fallback value for nullable timeout

Author: DennisAlund

lib/javascript_runtime.dart

@@ -135,7 +135,7 @@ abstract class JavascriptRuntime {
  //print('SET TIMEOUT EVAL RESULT: $setTImeoutResult');
  onMessage('SetTimeout', (dynamic args) {
  try {
- int duration = args['timeout'];
+ int duration = args['timeout'] ?? 0;
  String idx = args['timeoutIndex'];
 
  Timer(Duration(milliseconds: duration), () {