Separate empty view logic from ListView.

Don't rely on setting the empty list on the ListView for controlling
visibility of the list view and empty view. Save the reference and
control this in the call log fragment.

This removes a dependency on ListView-specific functionality which
is not found in the RecyclerView.

Bug: 19372817
Change-Id: I0a7e2e2366e258013ddbe30bd2ee7efb38349421