That's probably already fixed, the SVN ChangeLog has that entry:
2007-02-06 James Livingston <[EMAIL PROTECTED]>
* shell/rb-tray-icon.c: (rb_tray_icon_set_tooltip_icon),
(rb_tray_icon_construct_tooltip): make it not display a placeholder
icon when there is no art.
** Changed in: rhythmbox (Ubuntu)
Assignee: (unassigned) => Ubuntu Desktop Bugs
** Changed in: rhythmbox (Ubuntu)
Status: Confirmed => Fix Committed
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missing icon in tooltip of rhythmbox
https://launchpad.net/bugs/83701
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