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Return ErrClosed on Add() when the watcher is closed (#516)
Also consistently return nil for Remove() and WatchList(). For Remove() we could return an error, but I don't really see the point: if the watcher is closed it's basically a no-op so returning nil is fine. For WatchList() I'd like to return an error, but there is no error return, so explicitly returning nil is the best we can do. Fixes #511
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