dev: fixed notice in print preview

git-svn-id: file:///Users/Shitiz/Downloads/lssvn/source/limesurvey_dev@9101 b72ed6b6-b9f8-46b5-92b4-906544132732

admin/printablesurvey.php

@@ -1064,7 +1064,7 @@ function star_replace($input)
                     while ($mearow = $mearesult->FetchRow())
                     {
                         $longest_string = longest_string($mearow['question'] , $longest_string );
-                        if ($qidattributes['slider_layout']==1)
+                        if (isset($qidattributes['slider_layout']) && $qidattributes['slider_layout']==1)
                         {
                           $mearow['question']=explode(':',$mearow['question']);
                           $mearow['question']=$mearow['question'][0];