title: Joomla - swallow a JError::raiseError-Message silently
body: <p>Hey guys,
  is it possible to catch and ignore a JError::raiseError?
  I use JDatabase and if a user acts 'stupid' a duplicate entry can occur.
  But that's not a problem and can be ignored silently.</p>
  
  <p>Unfortunatelly this error is printed over the hole page. Now i dont want to
  drop a new query just to check if this primary key already exists.</p>