Warning after Update from ^2 to ^3

Looks like the update path has a bug or is incomplete. @lrwebks can you fix this?

$notificationObjects = $config->get('notification_objects');
should return an empty array but returns null, because it's not set as array in the update hook.

What's left to be done? Isn't this fine already?

Patch works, RTBC!

Thanks for the review!

Automatically closed - issue fixed for 2 weeks with no activity.