From e5a03eb0661a70c9a068fdf85f1cb31effbf26f5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20Szil=C3=A1gyi?= <peterke@gmail.com>
Date: Thu, 16 Apr 2015 18:24:39 +0300
Subject: [PATCH] whisper: don't issue signature warning if none present

---
 whisper/message.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/whisper/message.go b/whisper/message.go
index 0513627b4..07c673567 100644
--- a/whisper/message.go
+++ b/whisper/message.go
@@ -94,6 +94,11 @@ func (self *Message) sign(key *ecdsa.PrivateKey) (err error) {
 func (self *Message) Recover() *ecdsa.PublicKey {
 	defer func() { recover() }() // in case of invalid signature
 
+	// Short circuit if no signature is present
+	if self.Signature == nil {
+		return nil
+	}
+	// Otherwise try and recover the signature
 	pub, err := crypto.SigToPub(self.hash(), self.Signature)
 	if err != nil {
 		glog.V(logger.Error).Infof("Could not get public key from signature: %v", err)