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[BUG] git cherry-pick does not complain about unknown options


I was trying to cherry pick commits, while simultaneously changing the
author.  Unfortunately, cherry-pick doesn't have the same --author
option as git-commit.  However, instead of complaining about unknown

- when trying to cherry-pick one commit, it reported a BUG
- when trying to cherry-pick several commits, cherry-pick silently
  did nothing

All commits in tests existed in repository:

    $ git cherry-pick --author='TEST' <one-commit> # case 1
    error: BUG: expected exactly one commit from walk
    fatal: cherry-pick failed
    $ echo $?
    $ git cherry-pick --author='TEST' <commit1> <commit2>  # case 2
    $ echo $?
    $ git --version
    git version 2.18.0.windows.1

I've encountered this issue in Windows version, and  Johannes Schindelin
has confirmed that the issue is also present in Linux version.

Originally reported here: https://github.com/git-for-windows/git/issues/1751

Best regards, Andrei Rybak