taxonomy node listing disable

/**
 * Implements hook_menu_alter()
 *
 * Swaps out default taxonomy page callback to use a custom callback.
 * 
 * @param $items
 * 
 * @see og_vocab_grid_taxonomy_term_page().
 */
function og_vocab_grid_menu_alter(&$items) {
  $items['taxonomy/term/%taxonomy_term']['page callback'] = 'og_vocab_grid_taxonomy_term_page';
}

/**
 * Custom page callback that returns only the full view of the term if it is a
 * member of an OG vocabulary or, if it is not, the default taxonomy term page
 * (with node listings).
 * 
 * @param $term
 * @return array
 * 
 * @see taxonomy_term_page().
 */
function og_vocab_grid_taxonomy_term_page($term) {
  if (SOME CONDITION)) {
    $build = taxonomy_term_view($term, 'full');
  }
  else {
    $build = taxonomy_term_page($term);
  }

  return $build;
}