[Bug 35782] panel + panel = 0 panels

[Kai F. Lahmann]

Public bug reported:
https://launchpad.net/malone/bugs/35782

Affects: gnome-panel (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
sometimes, if gnome-panel can't quit sane, you'll get an message, that
one panel is already running, if you log in. Now this "additional" panel
will be closed. Problem: there's now no panel.