'Queue empty' message after adding new node to infinite queue

After adding new node to infinite queue (using 'node queue' tab) by clicking 'Add to queue' (which calls admin/content/nodequeue/.../add/.../...?tab) wrong message 'Queue empty' is shown. It is caused since function nodequeue_admin_add_node has not condition if queue is infinite when calling nodequeue_subqueue_size_text function. In attached patch I suggest simply solution.