In ezxmltext, you may declear empty table rows using a simple <tr/> tag.

This ain't supported in richtext. Instead, the tr tag must be extended with <td> tags corresponding to the table's column count

ezxmltext example

        <table class="list" width="90%" border="0" ez-colums="3">
            <tr/>

Must be converted into

  <informaltable class="list" width="90%">
    <tbody>
      <tr>
        <td/>
        <td/>
        <td/>
      </tr>