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[Bug]: Error parsing reponse when using NFC Plugin

See original GitHub issue

What is your BTCPay version?

v1.6.10.0 + LNURL NFC Support v1.0.4.0

How did you deploy BTCPay Server?

Lunanode automatic deployment

What happened?

If I pay with LNURLw NFC or LNURLw, the BTCPayServer send error code 500 even when the payment is successful and the NFC plugin struggles with parsing the response and the alert at the end is triggered in the try/catch at the bottom of lnurlwnfc.js. The payment is successful but it is annoying to close the javascript alert every time.

I hardly found the source code there https://github.com/Kukks/btcpayserver/tree/plugins/collection/Plugins/BTCPayServer.Plugins.NFC

`sendData: function (lnurl) {

        this.submitting = true;
        //Post LNURLW data to server
        var xhr = new XMLHttpRequest()
        xhr.open('POST', window.lnurlWithdrawSubmitUrl, true)
        xhr.setRequestHeader('Content-Type', 'application/json')
        xhr.send(JSON.stringify({lnurl, destination: this.$parent.srvModel.btcAddress}))
        const self = this;
        //User feedback, reset on failure
        xhr.onload = function () {
            if (xhr.readyState === xhr.DONE) {
                console.log(xhr.response);
                console.log(xhr.responseText);
                self.scanning = false;
                self.submitting = false;

                if(self.readerAbortController) {
                    self.readerAbortController.abort()
                }

                try {
                    var data = JSON.parse(xhr.response)

                    if(data && data.status == "ERROR") {
                        alert(data.reason)
                    }
                } catch (err) {
                    alert("Error parsing response.")
                }
            }
        }
    }`