masayuki0812/c3 — pull request #294 by bjlbernal (2014-05-30 19:48:22+00:00)
Title: transformForArcLabel NaN error.

Sometimes the data provided can't be used for transformForArcLabel (a stacked area chart where registered items came back as neither connected nor disconnected. http://jsfiddle.net/U5g3h/). I find that the startAngle and endAngle values arrived as NaN. To fix this I am checking before assigning x and y.