From e252dae499a8c682c92527262cca01af337438aa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20Szil=C3=A1gyi?= <peterke@gmail.com>
Date: Wed, 22 Apr 2015 17:24:35 +0300
Subject: [PATCH] rpc: use nil topic wildcards instead of ""

---
 rpc/args.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rpc/args.go b/rpc/args.go
index 8df483f088..4bd48e6d61 100644
--- a/rpc/args.go
+++ b/rpc/args.go
@@ -1061,7 +1061,7 @@ func (args *WhisperFilterArgs) UnmarshalJSON(b []byte) (err error) {
 		for idx, field := range list {
 			switch value := field.(type) {
 			case nil:
-				topics[idx] = []string{""}
+				topics[idx] = []string{}
 
 			case string:
 				topics[idx] = []string{value}