don't attempt to force-load blocks if they're already loaded.

Vanessa Ezekowitz

2014-07-23 29c7ff5228864bcf5456f391b122c9eb477c754b

 technic/machines/switching_station.lua

@@ -80,6 +80,7 @@
end

local load_position = function(pos)
   if minetest.get_node_or_nil(pos) then return end
   local vm = VoxelManip()
   local MinEdge, MaxEdge = vm:read_from_map(pos, pos)
end