When set "Show on only the listed pages" with no defined pages, 'Insert asset' should not show anywhere (it now shows always)

In _asset_page_match(), it is assumed that when the textbox in "Show on only the listed pages" is empty, user wants to show 'Insert asset' in every textarea, however, when I want to show asset on only listed pages with empty list, that means I DON'T want to show it anywhere (for example when I just want to use CCK asset field).

function _asset_page_match() {
  $page_match = FALSE;
  if (!user_access('create assets') && !user_access('administer assets')) return $page_match;
  $access_option = variable_get('asset_access_option', 1);
  $access_pages = variable_get('asset_access_pages', "node/add/*\nnode/*/edit");
  if ($access_pages) {
    // If the PHP option wasn't selected
    if ($access_option < 2) {
      $path = drupal_get_path_alias($_GET['q']);
      $regexp = '/^('. preg_replace(array('/(\r\n?|\n)/', '/\\\\\*/', '/(^|\|)\\\\<front\\\\>($|\|)/'), array('|', '.*', '\1'. preg_quote(variable_get('site_frontpage', 'node'), '/') .'\2'), preg_quote($access_pages, '/')) .')$/';
      $page_match = !($access_option xor preg_match($regexp, $path));
    }
    else {
      $page_match = drupal_eval($access_pages);
    }
  }
  // No pages were specified to block so show on all
  else {
    	$page_match = TRUE; //HERE, WE ALWAYS SHOW LINKS EVERYWHERE
  }
  return $page_match;
}

should change to

function _asset_page_match() {
  $page_match = FALSE;
  if (!user_access('create assets') && !user_access('administer assets')) return $page_match;
  $access_option = variable_get('asset_access_option', 1);
  $access_pages = variable_get('asset_access_pages', "node/add/*\nnode/*/edit");
  if ($access_pages) {
    // If the PHP option wasn't selected
    if ($access_option < 2) {
      $path = drupal_get_path_alias($_GET['q']);
      $regexp = '/^('. preg_replace(array('/(\r\n?|\n)/', '/\\\\\*/', '/(^|\|)\\\\<front\\\\>($|\|)/'), array('|', '.*', '\1'. preg_quote(variable_get('site_frontpage', 'node'), '/') .'\2'), preg_quote($access_pages, '/')) .')$/';
      $page_match = !($access_option xor preg_match($regexp, $path));
    }
    else {
      $page_match = drupal_eval($access_pages);
    }
  }
  // No pages were specified to block so show on all
  else {
    if ($access_option == 0) { //FIX: ONE EXTRA IF
      $page_match = TRUE;
    } elseif ($access_option == 1) {
      $page_match = FALSE;
    }
  }
  return $page_match;
}