handle null blocknumber in getTransactionByHash

pkg/eth/rpc_types.go

@@ -275,6 +275,28 @@ type (
 	}
 )
 
+func (tx *GetTransactionByHashResponse) MarshalJSON() ([]byte, error) {
+	type Alias GetTransactionByHashResponse
+	return json.Marshal(&struct {
+		BlockHash        interface{} `json:"blockHash"`
+		BlockNumber      interface{} `json:"blockNumber"`
+		TransactionIndex interface{} `json:"transactionIndex"`
+		*Alias
+	}{
+		BlockHash:        nullIfEmpty(tx.BlockHash),
+		BlockNumber:      nullIfEmpty(tx.BlockNumber),
+		TransactionIndex: nullIfEmpty(tx.TransactionIndex),
+		Alias:            (*Alias)(tx),
+	})
+}
+
+func nullIfEmpty(s string) interface{} {
+	if s == "" {
+		return nil
+	}
+	return s
+}
+
 func (r *GetTransactionByHashRequest) UnmarshalJSON(data []byte) error {
 	var params []interface{}
 	if err := json.Unmarshal(data, &params); err != nil {

pkg/transformer/eth_getTransactionByHash.go

@@ -100,8 +100,11 @@ func getTransactionByHash(ctx context.Context, p *qtum.Qtum, hash string) (*eth.
 
 	if ethTx == nil {
 		ethTx = &eth.GetTransactionByHashResponse{
-			Hash:  utils.AddHexPrefix(qtumDecodedRawTx.ID),
-			Nonce: "0x0",
+			Hash:             utils.AddHexPrefix(qtumDecodedRawTx.ID),
+			Nonce:            "0x0",
+			TransactionIndex: "",
+			BlockHash:        "",
+			BlockNumber:      "",
 
 			// Added for go-ethereum client and graph-node support
 			R: "0xf000000000000000000000000000000000000000000000000000000000000000",