less event logs for notif pruning

src/notifications.js

@@ -247,7 +247,7 @@ var async = require('async'),
 			}
 
 			if (!Array.isArray(nids) || !nids.length) {
-				return events.log('No notifications to prune');
+				return;
 			}
 
 			var	keys = nids.map(function(nid) {
@@ -256,8 +256,6 @@ var async = require('async'),
 
 			numPruned = nids.length;
 
-			events.log('Notification pruning. Expired Nids = ' + numPruned);
-
 			async.parallel([
 				function(next) {
 					db.sortedSetRemove('notifications', nids, next);