Remove no longer needed 'node.item is None' tests
Remove no longer needed 'node.item is None' tests

After commit e0256b6 ("Have MENU and COMMENT match _T_MENU and
_T_COMMENT"), the only falsy value for node.item is None, since all
token constants are truthy (since they're never 0).

ulfalizer/Kconfiglib,ulfalizer/Kconfiglib