Bug 13012 - suggestion.suggesteddate should be set to NOW if not defined

Bug 13012 - suggestion.suggesteddate should be set to NOW if not defined

Test Plan:
1) Apply this patch
2) prove t/db_dependent/Koha/Suggestions.t

Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit b2a8e726fe32d4aae3f279f4142af240c60d7fe5)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit e03ae320f7705cbf0a9e8ce872c5218ac901dab7)
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>