Bug 9135: updatedatabase.pl fails when DEBUG is set

Bug 9135: updatedatabase.pl fails when DEBUG is set

When the DEBUG environment variable is set to a true value, all DBI
errors are treated as fatal. Unfortunately, duplicate keys are
incredibly common in updatedatabase.pl, since sysprefs are often added
in testing, then re-added once the patches have been pushed to master
(or added when on a maintenance branch, and then re-added when the
system is upgraded to either a newer maintenance branch or master).
This patch disables fatal errors for the updatedatabase.pl script.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
All tests and perlcritic pass.
To test, run from command line:
export DEBUG=1
installer/data/mysql/updatedatabase.pl

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
If a query causes an error, the script continues as expected.
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Liz Rea <liz@catalyst.net.nz>