Below is the JS (jQuery) code of autocomplete's result function. You can see there's some lines where I print out <li>s containing some data properties (that come in as a result of automcomplete's AJAX call).

How could I rewrite this so that <li> would be conditionally rendered based on whether the property contains any value being either int or string (not empty string or whitespace) or something else that can be represented as string?

$(".clients-dropdown").result(function (event, data, formatted) {
    if (data) {
        // set the hidden input that we need for Client entity rematerialize
        $(".client-id").val(data.client_id);
        if (data.ClientName && data.Address1 && data.postalcode && data.postname) {
            $(".client-address").html(
                    "<li>" + data.ClientName + "</li>" +
                    "<li>" + data.Address1 + "</li>" +
                    "<li>" + data.postalcode + " " + data.postname + "</li>"
            );
            $(".client-details").html(
                    "<li>" + data.PrettyId + "</li>" +
                    "<li>" + data.VatNo + "</li>" +
                    "<li>" + data.Phone + "</li>" +
                    "<li>" + data.Mobile + "</li>" +
                    "<li>" + data.Email1 + "</li>" +
                    "<li>" + data.Contact + "</li>"
            );
        }
    }

Also, for the AJAX call, should my server side action return null when there's a null for a property in the database or empty string?