title: Select2 - disabling dropdown after clearing the option
body: <p>Im using Select2 plugin. My problem is simple - I dont want the dropdown list to show up when Im clearing the option.</p>
  
  <p>Here is my code:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;select class="select2-test" style="width: 20%;"&gt;
   &lt;option value=""&gt;&lt;/option&gt;
   &lt;option value="option1"&gt;Option 1&lt;/option&gt;
   &lt;option value="option2"&gt;Option 2&lt;/option&gt;
  &lt;/select&gt;
  
  &lt;script&gt;
  $('.select2-test').select2({
   placeholder: "Choose 1 option",
   allowClear: true
  });
  &lt;/script&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>I have tried to delete this line from the select2.min.js:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>this.on("close",function(){a.$container.removeClass("select2-container--open")})</code></pre>
  </div>
  </div>
  </p>
  
  <p>But it didnt help - the dropdown list wont show up after using it once. Any help will be appreciated. :)</p>