Hide td nulla in print JAVASCRIPT

On my system I made a button to print a screen. Everything is working properly, the problem is as follows.

In the photo below you can see that the Current User part is coming nulla, since it has no user data, this is ok, I just need it when the current user is null (no data) / p>

Could anyone help me with this? is part of printing I did in JavaScript. I will post the code below the photo.

DIV

<divclass="modal Detalhes fade" data-backdrop="static">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <div class="text-center">
                    <h3>Detalhes do paciênte!</h3>
                </div>
                <br />
                <div class="actions" style="float:right;">
                    <button class="ui teal submit button lef print-link" onclick="PrintElem('printOK','Usuário')" id="btnPrint">Imprimir</button>
                    <div class="ui approve green button btn_ok">OK</div>
                </div>
                <br /><br /><br />
                <div class="actions">
                    <div id="printOK">
                        <table style="width:100%" border="1">
                            <thead>
                                <tr>
                                    <th id="colAlterado">
                                        Usuário alterado
                                    </th>
                                    <th id="colAtual">
                                        Usuário atual
                                    </th>
                                </tr>
                            </thead>
                            <tbody>
                                <tr>
                                    <td id="trInser1"></td>
                                    <td id="tdInser2"></td>
                                </tr>
                            </tbody>
                        </table>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

JavaScript That pulls data to the div

$(document).ready(function () {
    $('[name="btn_detalhes"]').click(function () {
        var altaUtiId = $(this).attr('id');
        var patientId = $(this).attr('data-content');
        $.ajax({
            method: 'POST',
            url: '/Formulario/AltaUTI/VerificaDiff',
            data: { 'PatientId': patientId, 'AltaUtiId': altaUtiId },
            success: function (response) {
                var t1 = response[0];
                var t2 = response[1];
                var registro = response[2];
                if (t1.length > 0 || t2.length > 0) {
                    $('#msgLoading').fadeIn(0);
                    $('.modal.Detalhes').modal({
                        closable: false,
                        blurring: true,
                    }).modal('show');
                    for (var i = 0; i < t1.length; i++) {
                        $('#trInser1').append('<p> ' + t1[i] + ' </p>');
                        if (t2.length > 0) {
                            $('#tdInser2').append('<p> ' + t2[i] + ' </p>');
                            $('#tdInser2').removeClass('display-none');
                            $('#colAtual').removeClass('display-none');
                        }
                        else {
                            if (registro.length > 0)
                                $('#colAlterado').text('Usuário alterado');
                            else
                                $('#colAlterado').text('Usuário atual');

                            $('#tdInser2').addClass('display-none');
                            $('#colAtual').addClass('display-none');
                        }

                    }
                    $('#msgLoading').fadeOut(0);
                } else {
                    notif({
                        'type': 'error',
                        'msg': 'Não foi encontrado modificações no formulário!',
                        'position': 'center'
                    });
                }
            },
            error: function (response) {
                notif({
                    'type': 'error',
                    'msg': 'Erro na resposta do servidor!',
                    'position': 'center'
                });
            }
        })
    });

    $('.btn_ok').click(function () {
        $("p").remove();

        $('.modal.Detalhes').modal('hide');
    });
});

JavaScript Part of Printing

//Imprimir o modal gerado
function PrintElem(elem, form) {
    var mywindow = window.open('', 'PRINT', 'height=500,width=700');

    mywindow.document.write('<html><head><title>' + document.title + '</title>');
    mywindow.document.write('</head><body >');
    mywindow.document.write('<h1>Relatório de alteração detalhada de dados – ' + document.title + ' </h1>');
    mywindow.document.write('<h2>Formulário: ' + form + '</h2>');
    mywindow.document.write(document.getElementById(elem).innerHTML);
    mywindow.document.write('</body></html>');
    mywindow.document.close(); // necessary for IE >= 10
    mywindow.focus(); // necessary for IE >= 10*/

    mywindow.print();
    mywindow.close();

    return true;
}

If both Current User and Changed User have data, they usually display it as the below.