mysql case statement

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Hello,

how to select only if value is present?

    $query = $db->query("select menus.id, menus.name,
      case
        when panels.id is not null then '1'
        end as hiddenpanel

    from " . \DB_MENUS . " as menus
      left join " . \DB_HIDDENPANELS . " as panels on (menus.id = 
panels.menu_id)
    where menus.id='" . (int)$id . "'
    ");

i would like to select hiddenpanel only if there is a corresponding value in 
DB_HIDDENPANELS. At the moment i get NULL if there is no corresponding value 
in HIDDENPANELS table!

Br
Tanel 



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