Pubsub: Do not require items to persist cache content

Description

The CachingPubsubPersistenceProvider seems to persist things to the database only when there's at least one pubsub item added or removed. This delays or even prevents changes of other changes, such as the creation of an (empty) node.

Environment

None
Fixed
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Assignee

Guus der Kinderen

Reporter

Guus der Kinderen