title: Want to add none as value in select multiple
body: <p>I am using chosen.jquery.js for select field</p>
  
  <pre><code>&lt;select chosen multiple data-placeholder="Select Body Part(s)"  
  ng-options="option.Name as option.Name for option in BodyPartList" ng-model="Body_Part"&gt;
        &lt;option value="" disabled&gt;Select Body Part(s)&lt;/option&gt; 
  &lt;/select&gt;
  </code></pre>
  
  <p>But It shows only data-placeholder value in case of no data in model.
  I want to show "Select Body Part(s)" as a option in list.
  And user must not select this. Reason is that, I want to add dynamic "Unknown" value in list of Body_Parts. But it not reflect in list.</p>
  
  <p>Same work for select having single selection.</p>