title: select2 placeholder showing empty option
body: <p>too add  a placeholder in select2 i have to add an empty option tag in the code like this</p>
  <pre><code>&lt;select id=&quot;e2&quot; name=&quot;rol_id&quot; &gt;
                         &lt;option&gt;&lt;option&gt;
                         {foreach from=$data.roles item=rol}
                         &lt;option value={$rol.rol_id}&gt;{$rol.rol_nombre}&lt;/option&gt;
                         {/foreach}
   &lt;/select&gt;
  </code></pre>
  <p>but when i do that i get this option empty that is selectable
  <img src="https://i.stack.imgur.com/VdLUy.jpg" alt="enter image description here" /></p>
  <p>how can i not show that option but still the placeholder?</p>
  <p>Thanks!</p>