pam-auth-update: Use of uninitialized value $fieldname

This is on Ubuntu 11.10 with libpam-runtime 1.1.3-2ubuntu2.1.

What happened :

While working on a PAM module packaging, I felt the need to try and add some comments to my packages file in /usr/share/pam-configs/. Of course, it turns out there is no such thing as comments in those files, but my attempt of one was not handled very gracefully :

  # pam-auth-update
  Use of uninitialized value $fieldname in hash element at /usr/sbin/pam-auth-update line 688, <PROFILE> line 1.
  Use of uninitialized value $fieldname in hash element at /usr/sbin/pam-auth-update line 689, <PROFILE> line 1.
  # cat /usr/share/pam-configs/yubikey
  # test comment
  Name: YubiKey two-factor authentication with online validation (recommended)
  ...

What I would have expected :

Wouldn't it be reasonable for badly formatted profiles to be ignored/rejected?

Thanks.

/Fredrik