I've read concerning motorcycle storage, that for the long term (as in the order of years), it's a good idea to have the oil pan drained. This helps to prevent sludging/gelling of the oil as it sit's there, and stuborn precipitates I guess as well. It having been some time since I came across this information, I believe it has more to due with the use of crude-based oils of lesser API classifications.
Areas of concern would be having the engine accidentally started prior to refilling with oil...and as time in-storage increases, priming of the lubrication system as a recommendation.
The short of it...you'll be fine. Like Raven18940 noted, plug the whole if it's greater than a pencil eraser.