title: OData uri for filter collection empty or any eq 4
body: <p>Using OData, how can I make this filter? </p>
  
  <p>My class:</p>
  
  <pre><code>public class Aviso
  {
      public int Id { get; set; }
      public virtual ICollection&lt;User&gt; Destinatarios { get; set; }
      public string Url { get; set; }
  }
  </code></pre>
  
  <p>THE uri attempt: <code>/odata/avisos?$filter=(Destinatarios eq null or Destinatarios/count eq 0 or Destinatarios/any(it:it/Id eq 4) )</code> </p>
  
  <p>The goal is to return where any <code>Destinatarios</code> are 4 or collection is empty (or null).</p>