if ( $self->get('details') ) {
- return sum(
+ return sum( 0,
map { $_->amount || 0 }
grep { !defined($classnum) or $classnum eq $_->classnum }
@{ $self->get('details') }
my $sth = dbh->prepare($sql) or die dbh->errstr;
$sth->execute or die $sth->errstr;
- return $sth->fetchrow_arrayref->[0];
+ return $sth->fetchrow_arrayref->[0] || 0;
}