K3.1 [NFR]: Teaser #2354

hides message for guests
When i'am a guest i have 
<pre>Rendering Error in layout Message/Item: Property "userid" is not defined in C:\wamp\www\joomla3.3.3_test\components\com_kunena\template\crypsis\layouts\message\item\default.php on line 30
Layout was rendered in C:\wamp\www\joomla3.3.3_test\components\com_kunena\template\crypsis\layouts\topic\item\message\default.php on line 19</pre> because i'am not loggued