Fix radiation protection when armor group is not set (#509)

coil

2019-12-30 da95be53ec5703e808233d7b45fc42fb500863dd

 technic/tools/init.lua

@@ -13,4 +13,11 @@
dofile(path.."/chainsaw.lua")
dofile(path.."/tree_tap.lua")
dofile(path.."/sonic_screwdriver.lua")
dofile(path.."/prospector.lua")
dofile(path.."/vacuum.lua")

if minetest.get_modpath("screwdriver") then
   -- compatibility alias
   minetest.register_alias("technic:screwdriver", "screwdriver:screwdriver")
end