[perl5-dbi/dbi] f2a2df: Fix handling "0" different from ""

[Jens Rehsack]

  Branch: refs/heads/master
  Home:   https://github.com/perl5-dbi/dbi
  Commit: f2a2df0d62405a7e5d58d9a83edacd5acaef82e0
      
https://github.com/perl5-dbi/dbi/commit/f2a2df0d62405a7e5d58d9a83edacd5acaef82e0
  Author: Jens Rehsack <s...@netbsd.org>
  Date:   2013-06-24 (Mon, 24 Jun 2013)

  Changed paths:
    M Changes
    M lib/DBI/SQL/Nano.pm

  Log Message:
  -----------
  Fix handling "0" different from ""

Handle strings evaluating to a false value correct when simply expecting
data in DBI::SQL::Nano_::Statement part approval