Fixed NullPointerException
I encountered this NPE after dying in a world, unloading that specific world, and another plugin trying to access the last death location,
getLevel returns nullable but toBukkit(BlockPos, Level) doesnt allow null values
side note maybe improvement a little the "getWorld" in the Location method because not sure if is just me but the descriptions is like for this case i can still get the world but with the "IllegalArgumentException" but no, because that location comes after the location was created, unless i get that when player dies and use later when the world was unloaded.
Converted to draft for now, since this will cause an IllegalArgumentException when getting the world a converted location