504d4b7ea4
Sometimes an MPRIS media player will create and then destroy an object before the signals that handle the object's destruction can be created. This verifies that the object still exists after the necessary signals have been created. https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/2776 (cherry picked from commit f526e592fe11900bc311ebedab28713740bca212)