Does not render properly without at least one button

[mtompkins]

... at least on Win 8.1 where I'm testing. To reproduce, remove the button options and you'll receive a blank:

Called with:

notifier.notify('Title' {
      message: 'Message',
      icon: 'http://cl.ly/J49B/3951818241085781941.png',
      duration: 30000
 });

[rlayne]

can confirm

[bayleedev]

Thank you for reporting!

[zhouyuantest]

如何能解决这个问题？