When requesting from the cache, report all entries at bulk

Summary:
No need to signal separate times. This gives the client the possibility to know
whether it should request for more entries or not. Otherwise it might request them
when they will be fetched anyway.

Reviewers: Frameworks, whiting, leinir

Reviewed By: leinir

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D6532