t / t3901-8859-1.txton commit filter-branch: also don't fail in map() if a commit cannot be mapped (3520e1e)
   1: to be sourced in t3901 -- this is latin-1
   2GIT_AUTHOR_NAME="Áéí óú" &&
   3GIT_COMMITTER_NAME=$GIT_AUTHOR_NAME &&
   4export GIT_AUTHOR_NAME GIT_COMMITTER_NAME