lib/DBMerge.pm 

sub handle_skip_empty {
    my($self, $table) = @_;
    my $count = $self->source_row_count($table);
    if($count > 0) {
        $self->error(
            "Expected table '$table' to be empty, " .
            "found $count row(s)"
        );
    }
    else {
        say "$table - empty, skipped";
    }
}