title: Check if a html table contains a row with "No data"
body: <p>I have a table with might have no content. When I click a button, I want to populate it. But if it contains this:</p>
  
  <pre><code>  .............
    tbody#my_table
      tr
        td{colspan: 5} No data
  </code></pre>
  
  <p>I want to empty it first before appending rows to it. </p>
  
  <p>What's an easy and reliable way to determine if a table contains or not data? Or rather a row with "No data" </p>