Bug 21066: Resolve SQL errors in strict mode

Bug 21066: Resolve SQL errors in strict mode

DBD::mysql::st execute failed: Incorrect integer value: '' for column `koha_master`.`opac_news`.`number` at row 1 [for Statement "INSERT INTO opac_news ( content,number,lang,title,branchcode,borrowernumber,expirationdate,publicationdate ) VALUES ( ?,?,?,?,?,?,?,? )" with ParamValues: 0="test", 1="", 2="", 3="test", 4=undef, 5="51", 6='2020-08-11', 7='2020-08-04'] at /usr/share/koha/C4/NewsChannels.pm line 68.
DBD::mysql::st execute failed: Incorrect integer value: 'a' for column `koha_master`.`opac_news`.`number` at row 1 [for Statement "UPDATE opac_news SET lang = ?,publicationdate = ?,expirationdate = ?,number = ?,content = ?,branchcode = ?,title = ? WHERE idnew = ?;" with ParamValues: 0="", 1='2020-08-03', 2=undef, 3="a", 4="test", 5=undef, 6="test", 7="9"] at /usr/share/koha/C4/NewsChannels.pm line 107.

Test plan:
Do not apply this patch.
Enable strict mode in koha-conf.
Add new record in tools/news leaving 'Appear in position' blank.
The record is not added; you have a warn in your plack-error log.
Apply patch and try again.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>