- Prevents fallback-fallback avatar from displaying on top of
  a profile image in the smartlist and conversation view, in the
  case of a peer having a vcard image but no registered username.

Change-Id: I26b8e8f692a13935b3dadb2693eee830fc7f9a9d
Reviewed-by: Kateryna Kostiuk <kateryna.kostiuk@savoirfairelinux.com>