fix: return (None, None) for dequeue_any if no result

rq/queue.py

@@ -387,6 +387,7 @@ class Queue(object):
                 e.queue = queue
                 raise e
             return job, queue
+        return None, None
 
     # Total ordering defition (the rest of the required Python methods are
     # auto-generated by the @total_ordering decorator)