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We don't want to emit a signal for each event being added. That's
expensive and doesn't serve any purpose. We also don't have to save
the availability of data in QML as it isn't used anywhere.

Change-Id: I32db06a1955a7cfd6b569f50b81bf5278333b622
Reviewed-by: Kai Koehne <kai.koehne@digia.com>