Selectize allowEmptyOption

HTML

<script src="https://code.jquery.com/jquery-2.1.4.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/selectize.js/0.12.1/css/selectize.default.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/selectize.js/0.12.6/js/standalone/selectize.min.js"></script>
<div class="demo">
  <h2>&lt;select&gt; (allow empty)</h2>
  <div class="control-group">
    <label for="select-beast-empty">Beast:</label>
    <select id="select-beast-empty" class="demo-default" data-placeholder="Select a person...">
      <option value=null>None</option>
      <option value="4">Thomas Edison</option>
      <option value="1">Nikola</option>
      <option value="3">Nikola Tesla</option>
      <option value="5">Arnold Schwarzenegger</option>
    </select>
  </div>
</div>

JavaScript

$('#select-beast-empty').selectize({
  allowEmptyOption: true,
  create: true
});