title: react-select: Is there a way to remove the button on the right that expand the list, at least in async mode?
body: <p>I am using <code>AsyncSelect</code> and I would like to hide the arrow-down button on the right, the one that display the list of options.</p>
  
  <p>It can make sense when there are default options. But it my case I have none, so that button makes no sense it my situation.</p>
  
  <p>Is there a way to remove/hide it, when in <code>async</code> mode and there no default options ?</p>
  
  <p>Below is the code</p>
  
  <pre><code>&lt;AsyncSelect
    placeholder="Search ..."
    cacheOptions
    defaultOptions={false}
    value={this.state.currentValue} // Default to null
    loadOptions={this.fetchOptions}
    onChange={...}
    isClearable
  /&gt;
  </code></pre>
  
  <p>Also, is it possible to disable the fact that the component display an empty list when it get the focus, and only display matched options when at least one character is entered.</p>
  
  <p>Sorry for asking two in one. </p>
  
  <p>Thanks in advance.</p>