(bug 61939) Topic-titles not displaying in some topics (disappearing?)

This will make sure results where content failed to be retrieved from
externalstore are filtered out.
Other than just displaying data that failed to load properly, this
data would also be cached. We don't want that ;)

Bug: 61939
Change-Id: Idbd223f1be72f8d207d707d9807e732a8c7b971a
Merge "(bug 61939) Topic-titles not displaying in some topics (disappearing?)"