title: No hits with from a Zend Search MultiTerm Query? (There should be 3)
body: <p>I have a search form with a name, club, natranking, doublesranking and club field. I have selected a club from the selectbox, left the name field blank and clicked 'Search'. The result has no hits. There should be 3 as there are 3 records in the database that are part of that chosen club. Why is that? </p>
  
  <p>Thx.</p>
  
  <p>Controller class:</p>
  
  <pre><code>$search = $this-&gt;get('ewz_search.lucene');
  
  // Create query
  $terms = array(new Term($form-&gt;getData()-&gt;getName(), 'name'),
      new Term($form-&gt;getData()-&gt;getClub(), 'club'),
      new Term($form-&gt;getData()-&gt;getNatRanking(), 'natranking'),
      new Term($form-&gt;getData()-&gt;getNatDoublesRanking(), 'doublesranking')
  );
  $signs = array(TRUE, TRUE, TRUE, TRUE);
  $query = new MultiTerm($terms, $signs);
  
  // Get results 
  $results = $search-&gt;find($query);
  
  // Echo prints: "+name: +club:A.R.A. LA GANTOISE +natranking: +doublesranking:"
  echo $query;
  
  // This returns 0
  die("debug: " . count($results);
  </code></pre>
  
  <p>//EDIT</p>
  
  <p>This works (gives me 3 results):</p>
  
  <pre><code>$manual_query = "+name: +club:A.R.A. LA GANTOISE +natranking: +doublesranking:";
  </code></pre>