Immediately load new topics when none could be displayed

When 10 consecutive topics are moderated (e.g. spamming spree), nothing would be
displayed to the user. Until he scroll again, that is, which should fire another
API call to fetch the next batch op topics.
However, when nothing could be added, the user likely would not scroll - there's
nothing to scroll to.
Let's just automatically check if we're in "load more range" after adding the
batch of topics we just loaded and load new stuff if neccessary.

Change-Id: Ib4b5f8e11466bb4aaf35af5b2ebc642956eb0278
Merge "Immediately load new topics when none could be displayed"