Tryit Editor v2.7

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<!DOCTYPE html>
<html>
<head>
<style> 
table, td {
    border: 1px solid black;
    border-collapse: separate;
}
</style>

<script>
var _hmt = _hmt || [];
(function() {
var hm = document.createElement("script");
hm.src = "//hm.baidu.com/hm.js?73c27e26f610eb3c9f3feb0c75b03925";
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(hm, s);
})();
</script>
</head>
<body>

<table id="myTable" style="empty-cells:hide;">
  <tr>
    <td>January</td>
    <td>$100</td>
  </tr>
  <tr>
    <td>February</td>
    <td></td>
  </tr>
</table>
<br>

<button type="button" onclick="myFunction()">Return the emptyCells property</button>

<script>
function myFunction() {
    alert(document.getElementById("myTable").style.emptyCells);
}
</script>

</body>
</html>