repz,
<!DOCTYPE html>
<html>
<head>
<title>Untitled</title>
<meta charset="utf-8">
<style type="text/css">
</style>
<script>
document.addEventListener("DOMContentLoaded", function() {
const trs = document.querySelectorAll('tr');
trs.forEach(function(tr) {
const elems = [...tr.querySelectorAll('*')];
const empty = elems.every(({textContent}) => !textContent.trim())
empty && tr.remove()
});
});
</script>
</head>
<body>
<table>
<tr>
<td></td>
<td>
<table>
<tbody>
</tbody>
</table>
</td>
</tr>
</table>
</body>
</html>