[ticket/11390] Hide pagination when there are no notifications

PHPBB3-11390
[ticket/11390] Correctly separate list of notifications from header

PHPBB3-11390
Merge remote-tracking branch 'remotes/nickv/ticket/11390' into develop

# By Joas Schilling
# Via Joas Schilling
* remotes/nickv/ticket/11390:
  [ticket/11390] Correctly separate list of notifications from header
  [ticket/11390] Hide pagination when there are no notifications