求个js替换编辑器内 为空的写法~

Question

后台fck编辑器下自动排版会出现多余的<p></p>和<p> </p>

function processFormatText(textContext) {
    var text = DBC2SBC(textContext);
    var prefix = "　　";
    var tmps = text.split("\n");
    var html = "";
    var ifblank = document.getElementById("ifblank");
    for (i = 0; i < tmps.length; i++) {
      var tmp = tmps[i].trim();
      if (tmp.length > 0) {
      if (ifblank)
      {
          if (ifblank.checked)
            html += "<p>　　" + tmp + "</p>\n";
            else
            html += "<p>" + tmp + "</p>\n";
          }
      }else{
            html += "<p>" + tmp + "</p>\n";
      }
    }
  return html;
}

或者是否能修改下让自动排版不会出现多余的<p></p>和<p> </p>

高手辛苦回答一下