Tidying up getUser calls to profiles and some events
getUser calls are much more strict, and one place where this was found was in the (un)subscribe start/end event handlers, which resulted in making the Subscription class a bit stricter, regarding ::start and ::cancel at least. Several minor fixes in many files were made due to this. This does NOT touch the Foreign_link function, which should also have a more strict getUser call. That is a future project.
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