Commit 238b87d3 authored by Marco Trevisan's avatar Marco Trevisan 🎺

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

parent 8c01d341
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