Georges Basile Stavracas Neto 127ba318fd
polkit: Only unregister registered handles
If the initialization fails for some reason, for example by
running 'gnome-shell --replace', we should not crash because
of an attempt of unregistering an unregistered agent handle.

Fix that by checking if the handle is not NULL before calling
the unregistering routines.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/66
2018-11-06 13:05:29 -02:00
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