fix bad merge

--HG--
branch : 3.30

cubicweb/debug.py

@@ -30,6 +30,10 @@ SUBSCRIBERS = {
 }
 
 
+def debug_channel_has_subscribers(channel):
+    return len(SUBSCRIBERS.get(channel, [])) > 0
+
+
 def subscribe_to_debug_channel(channel, subscriber):
     """
     Allow to subscribe a callable to one of the debug channels.