title: Error 'Wrong parameters defined for filter' when specifying test parameter
body: <p>I want show only row where property <code>title!==null</code></p>
  
  <pre><code>var filter = new sap.ui.model.Filter({path:"title",test:function(oValue){
  return oValue!==null;
  }
  });
  </code></pre>
  
  <p>but I haìve an error: <code>Wrong parameters defined for filter.</code>
  This is the API that I use: <a href="https://openui5.hana.ondemand.com/docs/api/symbols/sap.ui.model.Filter.html" rel="nofollow">https://openui5.hana.ondemand.com/docs/api/symbols/sap.ui.model.Filter.html</a></p>
  
  <p>How can I set my filter correctly?</p>
  
  <p><strong>I have updated the runtime and now I can use my personal test function to test tileds!</strong></p>