Json to xml function eliminate empty property

Question

I found this function that converts JSON to XML, and the JSON I have has empty arrays as field "filters":[],.

so when I call the function json2xml(json, '') it eliminates that empty array, I want it to be like this < filters />.

This function is too complex for me I don't know how to modify it:

export default function json2xml(o, tab) {
    var toXml = function(v, name, ind) {
       var xml = "";
       if (v instanceof Array) {
          for (var i=0, n=v.length; i<n; i++)
             xml += ind + toXml(v[i], name, ind+"\t") + "\n";
       }
       else if (typeof(v) === "object") {
          var hasChild = false;
          xml += ind + "<" + name;
          for (var m in v) {
             if (m.charAt(0) === "@")
                xml += " " + m.substr(1) + "=\"" + v[m].toString() + "\"";
             else
                hasChild = true;
          }
          xml += hasChild ? ">" : "/>";
          if (hasChild) {
             for (m in v) {
                if (m === "#text")
                   xml += v[m];
                else if (m === "#cdata")
                   xml += "<![CDATA[" + v[m] + "]]>";
                else if (m.charAt(0) !== "@")
                   xml += toXml(v[m], m, ind+"\t");
             }
             xml += (xml.charAt(xml.length-1)==="\n"?ind:"") + "</" + name + ">";
          }
       }
       else {
          xml += ind + "<" + name + ">" + v.toString() +  "</" + name + ">";
       }
       return xml;
    }, xml="";
    for (var m in o)
       xml += toXml(o[m], m, "");
    return tab ? xml.replace(/\t/g, tab) : xml.replace(/\t|\n/g, "");
 }