With no objects, node_view_multiple() and comment_view_multiple() should return an empty array

The node_view_multiple() and comment_view_multiple() functions if given an empty array of nodes or comments respectively, will return a "non-empty" array:

array(
  '#sorted' => TRUE,
);

I propose that these functions should return an empty array in this case as it's easier to check if the render array is actually empty rather than having to remember to use element_children() to know if its empty.