Facebook SDK3.0 how to use WebDialog without picture

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http://stackoverflow.com – I referenced the sample code from Facebook SDK3.0, using WebDialog to post story on my wall. The sample code demonstrate the Bundle object use to construct WebDialog.FeedDialogBuilder Bundle params = new Bundle(); params.putString("name", "Facebook SDK for Android"); params.putString("caption", "Build great social apps and get more installs."); params.putString("description", "The Facebook SDK for Android makes it easier and faster to develop Facebook integrated Android apps."); params.putString("link", "https://developers.facebook.com/android"); params.putString("picture", "https://raw.gith (HowTos)