Marco Trevisan (Treviño) 238b87d386 grabHelper: Throw an error if the owner is not an actor
Starting from commit 7bb84dae, GrabHelper requires the owner to be an Actor as
we pass this to pushModal that assumes it to be as well.

So check that GrabHelper owner is an actor and throws an error if it is not the
case. This helps in tracking down issues such as gnome-shell-extensions!68

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/565
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