title: even after null check why I am getting null value in neo4j?
body: <p>I have tried the following query, wherein I am trying to get the person who has contact and if that contact directed a movie then movie name. in this, I am trying to avoid null for movie names.</p>
  <p>but below query is not working, <strong>I have even tried IS NOT NULL.</strong> and m.title &lt;&gt; NULL</p>
  <pre><code>MATCH (a:Person)-[:HAS_CONTACT]-&gt;(b)
  OPTIONAL MATCH (b)-[:DIRECTED]-&gt;(m:Movie)
  WHERE m &lt;&gt; NULL
  RETURN a.name, b.name,m.title
  LIMIT 1
  </code></pre>
  <p>RESULT:</p>
  <pre><code>    a.name  b.name  m.title
  &quot;Keanu Reeves&quot;  &quot;Rita Wilson&quot;   null
  </code></pre>