[Perl/perl5] 6464d5: charnames: Explicitly return undef for emptyinput

  Branch: refs/heads/smoke-me/khw-charnames
  Home:   https://github.com/Perl/perl5
  Commit: 6464d5795ec4e724e3105844a05f2accb176c371
      https://github.com/Perl/perl5/commit/6464d5795ec4e724e3105844a05f2accb176c371
  Author: Karl Williamson <khw@cpan.org>
  Date:   2020-05-13 (Wed, 13 May 2020)

  Changed paths:
    M lib/_charnames.pm
    M lib/charnames.pm
    M lib/charnames.t

  Log Message:
  -----------
  charnames: Explicitly return undef for empty input

Rather it returns an empty list for undefined or zero width input names.

This fixes #17768

• [Perl/perl5] 6464d5: charnames: Explicitly return undef for emptyinput by Karl Williamson