Avoid a nil index crash

Kyle

2013-02-22 985401a23d1581e71f762bdaeadfc19734fdf148

 technic/frames.lua

@@ -373,8 +373,8 @@
   end
   for _,obj in ipairs(objects) do
      obj:setpos(addVect(obj:getpos(),vect))
      if obj:get_luaentity().name == "pipeworks:tubed_item" then
         le=obj:get_luaentity()
      le=obj:get_luaentity()
      if le and le.name == "pipeworks:tubed_item" then
         le.start_pos=addVect(le.start_pos,vect)
      end
   end