Field Taxonomy: Term description displays "n/a" when description is empty (NULL in SQL)

I think it should just be empty. Here's how to reproduce: Create a taxonomy view and a taxonomy. Add one argument (e.g. tid) and then pass a tid of a term that doesn't have a description to the view. It will display "n/a". Running the query in SQL shows that the resulting column is NULL. Below my view though it's a very basic one.

$view = new view;
$view->name = 'term_description';
$view->description = 'Term description';
$view->tag = '';
$view->view_php = '';
$view->base_table = 'term_data';
$view->is_cacheable = FALSE;
$view->api_version = 2;
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */
$handler = $view->new_display('default', 'Defaults', 'default');
$handler->override_option('fields', array(
  'description' => array(
    'label' => '',
    'alter' => array(
      'alter_text' => 0,
      'text' => '',
      'make_link' => 0,
      'path' => '',
      'link_class' => '',
      'alt' => '',
      'prefix' => '',
      'suffix' => '',
      'help' => '',
      'trim' => 0,
      'max_length' => '',
      'word_boundary' => 1,
      'ellipsis' => 1,
      'strip_tags' => 0,
      'html' => 0,
    ),
    'exclude' => 0,
    'id' => 'description',
    'table' => 'term_data',
    'field' => 'description',
    'relationship' => 'none',
  ),
));
$handler->override_option('arguments', array(
  'tid' => array(
    'default_action' => 'not found',
    'style_plugin' => 'default_summary',
    'style_options' => array(),
    'wildcard' => 'all',
    'wildcard_substitution' => 'All',
    'title' => '',
    'breadcrumb' => '',
    'default_argument_type' => 'fixed',
    'default_argument' => '',
    'validate_type' => 'taxonomy_term',
    'validate_fail' => 'not found',
    'break_phrase' => 0,
    'not' => 0,
    'id' => 'tid',
    'table' => 'term_data',
    'field' => 'tid',
    'validate_user_argument_type' => 'uid',
    'validate_user_roles' => array(
      '2' => 0,
      '4' => 0,
      '3' => 0,
    ),
    'relationship' => 'none',
    'default_options_div_prefix' => '',
    'default_argument_user' => 0,
    'default_argument_fixed' => '',
    'default_argument_php' => '',
    'validate_argument_node_type' => array(
      'image' => 0,
      'action' => 0,
      'book' => 0,
      'media' => 0,
      'news' => 0,
      'page' => 0,
      'resource' => 0,
      'story' => 0,
    ),
    'validate_argument_node_access' => 0,
    'validate_argument_nid_type' => 'nid',
    'validate_argument_vocabulary' => array(
      '3' => 0,
      '4' => 0,
      '1' => 0,
      '2' => 0,
      '5' => 0,
      '6' => 0,
      '8' => 0,
    ),
    'validate_argument_type' => 'tid',
    'validate_argument_transform' => 0,
    'validate_user_restrict_roles' => 0,
    'validate_argument_php' => '',
  ),
));
$handler->override_option('access', array(
  'type' => 'none',
));
$handler->override_option('cache', array(
  'type' => 'none',
));