title: queryForRowSet doesn't return results with null in optional date parameter
body: <p>I added optional date parameters to several Oracle SQL/Code which worked except from specific SQL used in combination with <code>queryForRowSet</code></p>
  
  <p>My SQL with optional date:</p>
  
  <pre><code>SELECT * from I where  I.MYDATE &lt;= nvl(?, I.MYDATE)
  </code></pre>
  
  <p>Code sending null for optional date:</p>
  
  <pre><code>Object[] param= new Object[] {null};
  SqlRowSet result = jdbcTemplate.queryForRowSet(QUERY, param);
  </code></pre>
  
  <p>If I remove parameter SQL return results, but with null it doesn't return results</p>