Use null instead of undefined on after parsing JSON
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@ -239,7 +239,7 @@ function checkboxClick(event, el) {
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function setHtml(id, html) {
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var el = document.getElementById(id);
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if (el) {
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if (html == undefined) {
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if (html == null) {
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el.parentNode.innerHTML = ' ';
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} else {
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el.innerHTML = html;
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