fix a bug in the lua binding for writing a single unit

core/src/bindings/bind_storage.c

@@ -64,9 +64,7 @@ static int tolua_storage_write_unit(lua_State * L)
 {
     gamedata *data = (gamedata *)tolua_tousertype(L, 1, 0);
     struct unit *u = (struct unit *)tolua_tousertype(L, 2, 0);
-  if (global.data_version) {
     write_unit(data, u);
-  }
     return 0;
 }