From b9e260a704a259e42a867514d1147fff5a3fe5ff Mon Sep 17 00:00:00 2001
From: Evgenii Stratonikov <evgeniy@nspcc.ru>
Date: Fri, 19 Jun 2020 10:44:05 +0300
Subject: [PATCH] smartcontract: omit empty value in JSON for Interop/Any
 parameters

---
 pkg/smartcontract/parameter.go | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pkg/smartcontract/parameter.go b/pkg/smartcontract/parameter.go
index 4242cb08a..e3ce46f1e 100644
--- a/pkg/smartcontract/parameter.go
+++ b/pkg/smartcontract/parameter.go
@@ -53,7 +53,7 @@ func NewParameter(t ParamType) Parameter {
 
 type rawParameter struct {
 	Type  ParamType       `json:"type"`
-	Value json.RawMessage `json:"value"`
+	Value json.RawMessage `json:"value,omitempty"`
 }
 
 // MarshalJSON implements Marshaler interface.
@@ -88,7 +88,7 @@ func (p *Parameter) MarshalJSON() ([]byte, error) {
 		ppair := p.Value.([]ParameterPair)
 		resultRawValue, resultErr = json.Marshal(ppair)
 	case InteropInterfaceType, AnyType:
-		resultRawValue = []byte("null")
+		resultRawValue = nil
 	default:
 		resultErr = errors.Errorf("Marshaller for type %s not implemented", p.Type)
 	}