From ace56da7b3639d7a466b24ccd96e54791a11600f Mon Sep 17 00:00:00 2001
From: Matthias Radestock <matthias.radestock@gmail.com>
Date: Thu, 14 May 2015 12:02:56 +0100
Subject: [PATCH] allow Gossiper.Gossip to return nil

...to indicate 'no data'
---
 router/gossip.go | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/router/gossip.go b/router/gossip.go
index 5ae23709..17201143 100644
--- a/router/gossip.go
+++ b/router/gossip.go
@@ -107,13 +107,17 @@ func (router *Router) NewGossip(channelName string, g Gossiper) Gossip {
 
 func (router *Router) SendAllGossip() {
 	for _, channel := range router.GossipChannels {
-		channel.Send(router.Ourself.Name, channel.gossiper.Gossip())
+		if gossip := channel.gossiper.Gossip(); gossip != nil {
+			channel.Send(router.Ourself.Name, gossip)
+		}
 	}
 }
 
 func (router *Router) SendAllGossipDown(conn Connection) {
 	for _, channel := range router.GossipChannels {
-		channel.SendDown(conn, channel.gossiper.Gossip())
+		if gossip := channel.gossiper.Gossip(); gossip != nil {
+			channel.SendDown(conn, channel.gossiper.Gossip())
+		}
 	}
 }