[backend] Only print debug message if there are splits to schedule

beat/web/backend/schedule.py

@@ -196,12 +196,14 @@ def schedule():
     sorted_queues = Queue.objects.order_by('-cores_per_slot',
         'max_slots_per_user')
 
-    logger.debug('Ordered queues: %s',
-        ','.join([k.name for k in sorted_queues]))
-
     splits_to_consider = \
         [_select_splits_for_queue(q) for q in sorted_queues]
 
+    if not any(splits_to_consider): return []
+
+    logger.debug('Ordered queues: %s',
+        ','.join([k.name for k in sorted_queues]))
+
     # decides which split to run considering the 'on-the-fly' availability
 
     # workers that can run job splits