...
<div id="attributeRelease">
 <table>
  <thead>
   <tr>
    <th colspan="3">
     #springMessageText("idp.attribute-release.attributesHeader", "Information to be Provided to Service")
    </th>
   </tr>
  </thead>
  <tbody>
   #foreach ($attribute in $attributeReleaseContext.getConsentableAttributes().values())
    #set( $empty = false)
    #foreach($value in $attribute.values)
     #if ($value.class.name == "net.shibboleth.idp.attribute.EmptyAttributeValue")
      #set ($empty = true)
      #break
     #end
    #end
    #if(!$empty)
     <tr>
      <td>$encoder.encodeForHTML($attributeDisplayNameFunction.apply($attribute))</td>
      <td>
      #foreach ($value in $attribute.values)
       <strong>$encoder.encodeForHTML($value.getDisplayValue())</strong>
       <br>
      #end
      </td>
      <td style="vertical-align: top">
       #if ($attributeReleaseFlowDescriptor.perAttributeConsentEnabled)
        #set ($inputType = "checkbox")
       #else
        #set ($inputType = "hidden")
       #end
       <input id="$attribute.id" type="$inputType" name="_shib_idp_consentIds" value="$encoder.encodeForHTML($attribute.id)" checked>
      </td>
     </tr>
    #end
   #end
  </tbody>
 </table>
</div>

...