Don't go out of boundaries.

Because of the error: (SQL::Abstract::puke(): [SQL::Abstract::__ANON__] Fatal: SQL::Abstract before v1.75 used to generate incorrect SQL when the -IN operator was given an undef-containing list: !!!AUDIT YOUR CODE AND DATA!!! (the upcoming Data::Query-based version of SQL::Abstract will emit the logically correct SQL instead of raising this exception))
Perltidy
Require SQL::Abstract at least 1.75 version.

SQL::Abstract before v1.75 used to generate incorrect SQL when the -IN operator was given an undef-containing list.