Bug 11344: (QA follow-up) Fix empty section warning

Bug 11344: (QA follow-up) Fix empty section warning

*** WARNING: empty section in previous paragraph at line 28 in file misc/cronjobs/advance_notices.pl

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit c117df8e30c2067dd70a4573989d24e354145adc)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit c3858bd4b8284ee14152fe76185f48901244c089)

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>