Crash with multiple categories and ordered bars

[hnguye34]

Hello,

When I am using ordered bars (to have multiple categories side by side), all label are "Nan".
Because the series.data[i][2] can be empty and so "b" variable is undefined.
var b = series.data[i].length > 2 ? series.data[i][2] : 0; (line 59)

Could you add a check to prevent this crash please ?
(Something like for example): var b = series.data[i].length > 2 && series.data[i][2] ? series.data[i][2] : 0; )

Thank you for your help !

[cleroux]

Thank you for reporting this and the suggested fix. I have pushed the commit to master.