itest: allow setting empty peer pubkey on tapd SendPayment

Author: GeorgeTsagk

itest/assets_test.go

@@ -1687,14 +1687,18 @@ func payInvoiceWithAssets(t *testing.T, payer, rfqPeer *HarnessNode,
 		sendReq.MaxShardSizeMsat = 80_000_000
 	}
 
-	var rfqBytes []byte
+	var rfqBytes, peerPubKey []byte
 	cfg.rfq.WhenSome(func(i rfqmsg.ID) {
 		rfqBytes = make([]byte, len(i[:]))
 		copy(rfqBytes, i[:])
 	})
 
+	if rfqPeer != nil {
+		peerPubKey = rfqPeer.PubKey[:]
+	}
+
 	request := &tchrpc.SendPaymentRequest{
-		PeerPubkey:     rfqPeer.PubKey[:],
+		PeerPubkey:     peerPubKey,
 		PaymentRequest: sendReq,
 		RfqId:          rfqBytes,
 		AllowOverpay:   cfg.allowOverpay,
@@ -1733,9 +1737,6 @@ func payInvoiceWithAssets(t *testing.T, payer, rfqPeer *HarnessNode,
 		acceptedQuote := quoteMsg.GetAcceptedSellOrder()
 		require.NotNil(t, acceptedQuote)
 
-		peerPubKey := acceptedQuote.Peer
-		require.Equal(t, peerPubKey, rfqPeer.PubKeyStr)
-
 		rpcRate := acceptedQuote.BidAssetRate
 		rate, err := rpcutils.UnmarshalRfqFixedPoint(rpcRate)
 		require.NoError(t, err)