t / t5100 / info0011on commit try_remove_empty_parents(): teach to remove parents of reflogs, too (a8f0db2)
   1Author: A U Thor
   2Email: a.u.thor@example.com
   3Subject: Xyzzy
   4Date: Fri, 8 Aug 2008 13:08:37 +0200 (CEST)
   5