title: P4Python - Create a pending changelist and keep default pending
body: <p>I use</p>
  
  <pre><code>change = P4.fetch_change()
  change['Description'] = Description
  result = p4.save_change(change)
  </code></pre>
  
  <p>but it will move my default file into this changelist.</p>
  
  <p>is there has any way to just create empty pending changelist and keep my file in the default?</p>