Fix notification for notes on a wall. (regression)
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Created by: robbkidd
The fact that Notes on Walls have a noteable_type value of "nil" got lost in the refactoring of the observer.
Fixes regression issue identified by @riyad that I introduced (#1675) with the MailerObserver -> NoteObserver refactoring.
The comparison view may be inaccurate due to merge conflicts.
Resolve these conflicts or ask someone with write access to this repository to merge it locally.