JavaScript graphing library which supports line graphs with missing data - javascript

I am looking for a charting library that supports creating graphs with missing data.
A bit of an odd request, but required for my application as my DB doesn't always have a complete data set.
I'm currently using ChartJS to create a line graph, however because there are holes in my data, it is causing my graph to look quite messy.
The graph contains months on the x axis, and a users score on the y axis. There is one year of data, broken in months... and then the user score ranges from 0 - 10
However, sometimes I end up with months with no data, and it is causing NaN for that month. Does anyone know of a graph library that supports missing data, or a work around solution for such an issue?

You actually refer to chart.js
ChartJS supports missing data

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Round the data to the closest interval. The problem with this is the data is no longer accurate for that particular moment which is a problem.
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Use a different charting library (last resort)
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Have you consider to modify labels, by formatter ?
http://api.highcharts.com/highstock#xAxis.labels.formatter
http://api.highcharts.com/highstock#highcharts.dateFormat()

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