#84189 by webchick. Properly initialize variables.

includes/theme.inc

@@ -533,6 +533,10 @@ function theme_links($links, $attributes = array('class' => 'links')) {
       // Is the title HTML?
       $html = isset($link['html']) && $link['html'];
 
+      // Initialize fragment and query variables.
+      $link['query'] = isset($link['query']) ? $link['query'] : NULL;
+      $link['fragment'] = isset($link['fragment']) ? $link['fragment'] : NULL;
+
       if ($link['href']) {
         $output .= l($link['title'], $link['href'], $link['attributes'], $link['query'], $link['fragment'], FALSE, $html);
       }