use hasKey instead of getString

Author: albinhubsch

android/src/main/java/com/vydia/UploaderModule.java

@@ -207,10 +207,8 @@ public void onCancelled(Context context, UploadInfo uploadInfo) {
 
  UploadNotificationConfig notificationConfig = new UploadNotificationConfig();
 
- if(notification.getString("notificationChannel")){
+ if(notification.hasKey("notificationChannel")){
  notificationConfig.setNotificationChannelId(notification.getString("notificationChannel"));
- }else{
- notificationConfig.setNotificationChannelId("Background-Upload-Service");
  }
 
  request.setNotificationConfig(notificationConfig);