stop test if lnurl lookup fails

Author: riccardobl

examples/ArduinoESP32TestNWC/ArduinoESP32TestNWC.ino

@@ -103,6 +103,7 @@ void testNWC() {
         transport->getInvoiceFromLNAddr(PAYOUT_ADDRESS, PAYOUT_AMOUNT_MSAT, "Arduino NWC test", [&](String invoice) {
             if (NostrString_equals(invoice, "")) {
                 Serial.println("[!] Error: Could not get invoice from LN address");
+                return;
             }
             Serial.println("[!] Paying " + String(PAYOUT_AMOUNT_MSAT) + " msats to " + PAYOUT_ADDRESS + " invoice: " + invoice);
             nwc->payInvoice(