title: Django filter with OR statement
body: <p>I need to write filter that will check situation like:</p>
  
  <p>if there are an actors with name "John" than return these actors, otherwise search actors with name "David". </p>
  
  <p>Pseudocode may look like:</p>
  
  <pre><code>Actors.filter(name="John" or name="David")
  </code></pre>
  
  <p>Can i do something like this in Django using one query? or do I have to use <code>if</code> ?</p>
  
  <pre><code>actors = Actor.filter(name="John")
  if not actors.exists():
      actors = Actors.filter(name="David")
  </code></pre>