Ticket #692 (Closed: fixed)

As it was possible before, now GreenBox? avoid to add an Playlist to onother one. ADDITIONAL INFORMATION: pear_error Object ( [error_message_prefix] => [mode] => 1 [level] => 1024 [code] => [message] => GreenBox?::addAudioClipToPlaylist: object type not supported (playlist) [userinfo] => [backtrace] => Array ( [0] => Array ( [file] => /usr/share/php/PEAR.php [line] => 542 [function] => pear_error [class] => pear_error [type] => -> [args] => Array ( [0] => GreenBox?::addAudioClipToPlaylist: object type not supported (playlist) [1] => [2] => 1 [3] => [4] => ) ) [1] => Array ( [file] => /var/www/livesupport/modules/storageServer/var/GreenBox?.php [line] => 505 [function] => raiseerror [class] => pear [type] => :: [args] => Array ( [0] => GreenBox?::addAudioClipToPlaylist: object type not supported (playlist) ) ) [2] => Array ( [file] => /var/www/livesupport/modules/htmlUI/var/ui_playlist.class.php [line] => 151 [function] => addaudiocliptoplaylist [class] => greenbox [type] => -> [args] => Array ( [0] => 220bb665210b77b1 [1] => 35 [2] => 352d3d012377e809f7a679539ee968d4 ) ) [3] => Array ( [file] => /var/www/livesupport/modules/htmlUI/var/html/ui_handler.php [line] => 192 [function] => additem [class] => uiplaylist [type] => -> [args] => Array ( [0] => 35 ) ) ) [callback] => )