Issue title: Sunburst Zooming in nvd3 1.8.5 version for last record we get random Incomplete circle.
 Issue body: here is the plunker .
http://plnkr.co/edit/F7jBdN5nR8VoFrvzk4iW?p=preview

Initially  
![six screen 1](https://user-images.githubusercontent.com/5784023/30022989-52e2eed0-918b-11e7-8385-ebec112d6b95.png)
![six screen](https://user-images.githubusercontent.com/5784023/30022990-53063fac-918b-11e7-9392-4cf939a1d506.png)
 Comments: 
 Comment 0: Well that's weird!  If you can figure out a fix, please be sure to send us a pull request! 
 Comment 1: is it nvd3 or angular-nvd3 ? if angular-nvd3, you may have to raise the issue with that team?

Also looks like the code works fine in mozilla firefox and not properly working in chrome..
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