Bug 20144: [sql_modes] Set issuingrules.no_auto_renewal_after to NULL in tests
Fix for:
Incorrect integer value: '' for column 'no_auto_renewal_after'
FIXME - must we update values for existing installs?
TODO - check if can be set to an empty string from the interface
Signed-off-by: Josef Moravec <josef.moravec@gmail.com> Signed-off-by: Julian Maurice <julian.maurice@biblibre.com> Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>