fix undefined var check before login - sessid is not set etc

git-svn-id: https://svn.code.sf.net/p/postfixadmin/code/trunk@1237 a1433add-5e2c-0410-b055-b7f2511e0802

templates/footer.tpl

@@ -3,10 +3,12 @@
 	<a target="_blank" href="http://postfixadmin.com/">Postfix Admin {$version}</a>
 	&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;
 	<a target="_blank" href="http://postfixadmin.sf.net/update-check.php?version={$version|escape:"url"}">{$PALANG.check_update}</a>
-	{if $smarty.session.sessid.username}
-		&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;	
-		{$PALANG.pFooter_logged_as|replace:"%s":$smarty.session.sessid.username}
-	{/if}
+    {if isset($smarty.session.sessid)}
+        {if $smarty.session.sessid.username}
+            &nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;	
+            {$PALANG.pFooter_logged_as|replace:"%s":$smarty.session.sessid.username}
+        {/if}
+    {/if}
 	{if $CONF.show_footer_text == 'YES' && $CONF.footer_link}
 		&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;
 		<a href="{$CONF.footer_link}">{$CONF.footer_text|escape}</a>