depends if it leaks oil ... but my mate has a HT gts in the shed that had been there for about 2 years . its up on blocks just to keep the tryes off the ground and the battery is out... but most of all! the engine has nearly 15 liters of oil in it, just the cheap stuff full in the bores right up to the rockers i thought it was a smart idea and every few months he rotates the crank just a few degrees one way then back .... :-\ but that thing is for his son so he ain't bringing it out into the daylight any time soon..
a year isn't that long i wouldn't think you would have a problem ... its just what you do when you get back eg: change fuel ..full service and some rost off or wd 40 down the bore and rotate by hand then give a few cranks with plugs out should be fine