No Data for X axis creating extra 0 on line graph

[atentis]

Im having an issue where a zero is automatically appearing where i dont have data. For example below I do not have a 3rd element in the array for desktops and because of that a zero is getting made under tablets as you can see in my screenshot. How do I stop this as I only want it to go from the first 0 (Laptops) to 450 (tablets)

x: "Desktops",
y: [300, 142]

http://plnkr.co/edit/cIcLyd?p=preview