my %usage_class = map { $_->classnum => $_ } qsearch( 'usage_class', {} );
$usage_class{''} ||= new FS::usage_class { 'classname' => '', 'weight' => 0 };
my %usage_class = map { $_->classnum => $_ } qsearch( 'usage_class', {} );
$usage_class{''} ||= new FS::usage_class { 'classname' => '', 'weight' => 0 };