If views_natural_sort is enabled and there are 0 nodes availiable, a division...

If views_natural_sort is enabled and there are 0 nodes availiable, a division by 0 error occurs. Fixed.

views_natural_sort.admin.inc

@@ -52,6 +52,11 @@ function views_natural_sort_rebuild_index(&$context) {
       'SELECT COUNT(nid) FROM {node} WHERE nid <= :max',
       array('max' => $sandbox['max'])
     )->fetchField();
+
+    if ($sandbox['total'] == 0) {
+      $context['finished'] = 1;
+      return;
+    }
     $sandbox['current'] = 0;
     $context['results']['nodes'] = 0;
   }