nl_tokens: Internal helper to delete a low level key and then if the top - level is empty get that one too .
pl_tokens: function _full_delete ( hash , key1 , key2 ) { if ( key1 && key2 && hash && hash [ key1 ] && <mask> [ key1 ] [ key2 ] ) { delete hash [ key1 ] [ key2 ] ; } if ( us . isEmpty ( hash [ key1 ] ) ) { delete hash [ key1 ] ; } }