title: Django - Exclude a value from a .value_list
body: <p>Greeting everyone, I trying to filter a specific value list from my model below is my code :</p>
  
  <pre><code>employee_name = WorkOrder.objects.filter(
                      project_id=48
                   ).values_list(
                      'assign_to__official_name', flat=True
                   ).distinct()
  print(employee_name)
  </code></pre>
  
  <p>and this is the output I receive</p>
  
  <pre><code>&lt;QuerySet ['JOHN', 'GEOFF', 'KYLE', 'NONE', 'BRUCE', 'CLARK',]&gt;
  </code></pre>
  
  <p>How can I exclude the value <code>'NONE'</code> from this queryset based on its value and not its ID? </p>
  
  <p>Anyhelp is much appreciated thanks</p>