Since that git has supported the --always option for the git-format-patch
command to create a patch with an empty commit message, git-am should
support applying and committing with empty patches.

----------------------------------------------------------------------------

Changes since v1:

 1. add a case when not passing the --always option.
 2. rename the --always option to --allow-empty.

----------------------------------------------------------------------------

Changes since v2:

 1. rename the --allow-empty option to --empty-commit.
 2. introduce three different strategies (die|skip|asis) when trying to
    record empty patches as empty commits.

----------------------------------------------------------------------------

Changes since v3:

 1. generate the missed file for test cases.
 2. grep -f cannot be used under Mac OS.

----------------------------------------------------------------------------

Changes since v4:

 1. rename the --empty-commit option to --empty.
 2. rename three different strategies (die|skip|asis) to die, drop and keep
    correspondingly.

----------------------------------------------------------------------------

Changes since v5:

 1. throw an error when passing --empty option without value.

----------------------------------------------------------------------------

Changes since v6:

 1. add i18n resources.

----------------------------------------------------------------------------

Changes since v7:

 1. update code according to the seen branch.
 2. fix the wrong document of git-am.
 3. sign off commits by a real name.

----------------------------------------------------------------------------

Changes since v8:

 1. update the committer's name with my real name to fix DCO of GGG.

----------------------------------------------------------------------------

Changes since v9:

 1. imitate the signed name format of
    https://lore.kernel.org/git/pull.1143.git.git.1637347813367.gitgitgadget@gmail.com
    .

cc: René Scharfe l.s.r@web.de cc: Phillip Wood phillip.wood123@gmail.com cc:
Aleen 徐沛文 pwxu@coremail.cn

cc: Aleen 徐沛文 pwxu@coremail.cn

徐沛文 (Aleen) (2):
  doc: git-format-patch: describe the option --always
  am: support --empty=<option> to handle empty patches

 Documentation/git-am.txt           |  8 +++++
 Documentation/git-format-patch.txt |  6 +++-
 builtin/am.c                       | 55 +++++++++++++++++++++++++++---
 t/t4150-am.sh                      | 49 ++++++++++++++++++++++++++
 4 files changed, 112 insertions(+), 6 deletions(-)

base-commit: f8b28837226f3932b867ca88a4f830bf203d2afe

Submitted-As: https://lore.kernel.org/git/pull.1076.v11.git.1637681215.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.1076.git.1636693095.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.1076.v2.git.1636700040.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.1076.v3.git.1636972769.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.1076.v4.git.1637039888.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.1076.v5.git.1637141636.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.1076.v6.git.1637232636.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.1076.v7.git.1637298298.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.1076.v8.git.1637563611.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.1076.v9.git.1637564554.gitgitgadget@gmail.com
In-Reply-To: https://lore.kernel.org/git/pull.1076.v10.git.1637567471.gitgitgadget@gmail.com