Avoid a nil index crash

Kyle

2013-02-22 985401a23d1581e71f762bdaeadfc19734fdf148

 technic/solar_panel_mv.lua

File was renamed from technic/technic/solar_panel_mv.lua
@@ -73,4 +73,6 @@
         meta:set_float("active",0)
      end
   end,
}) 
}) 

register_MV_machine ("technic:solar_panel_mv","PR")