Consider using null pattern for GameObjects

[JakubLinhart]

So it is not necessary to check a GameObject for null when retrieving it from UO.Items/Mobiles/Corpses.

Something like this should be possible then:

if (UO.Items[myItemId].GetDistance(UO.Me) < 2)
if (UO.Items[myItemId].Exists)

[JakubLinhart]

FirstOrDefault has to support the null pattern as well.