From c939d2283e13a7edd37c6ea560120a901e533fcc Mon Sep 17 00:00:00 2001
From: Vladimir Mihailenco <vladimir.webdev@gmail.com>
Date: Thu, 22 Dec 2016 13:26:00 +0200
Subject: [PATCH] Allow creating PubSub without channels.

---
 redis.go | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/redis.go b/redis.go
index 6a3b04c6..3e9ee07e 100644
--- a/redis.go
+++ b/redis.go
@@ -359,11 +359,23 @@ func (c *Client) pubSub() *PubSub {
 // Subscribe subscribes the client to the specified channels.
 func (c *Client) Subscribe(channels ...string) (*PubSub, error) {
 	pubsub := c.pubSub()
-	return pubsub, pubsub.Subscribe(channels...)
+	if len(channels) > 0 {
+		if err := pubsub.Subscribe(channels...); err != nil {
+			pubsub.Close()
+			return nil, err
+		}
+	}
+	return pubsub, nil
 }
 
 // PSubscribe subscribes the client to the given patterns.
 func (c *Client) PSubscribe(channels ...string) (*PubSub, error) {
 	pubsub := c.pubSub()
-	return pubsub, pubsub.PSubscribe(channels...)
+	if len(channels) > 0 {
+		if err := pubsub.PSubscribe(channels...); err != nil {
+			pubsub.Close()
+			return nil, err
+		}
+	}
+	return pubsub, nil
 }