Make sure authors always have an email address.

Git (inconsistently) does not like it when a committer has no email address.
When they're CENSORED in the authors file, use the provided cpan.org address.

This is what Travis diagnostics revealed...

Attempt to free unreferenced scalar: SV 0x106a8310 at /home/travis/perl5/perlbrew/perls/5.18/lib/5.18.2/Test/Builder.pm line 245.