Incomplete bash completion on git commit: --allow-empty-message and --allow-empty

[Hadi Safari <hadi@xxxxxxxxxxxxx>]

Hi!

I'm wondering why there isn't --allow-empty and --allow-empty-message in 
completeion list of git commit command. I'm getting only following flags 
from v2.18.0 on `git commit --`:

--ahead-behind      --include           --reedit-message=
--all               --interactive       --reset-author
--amend             --long              --reuse-message=
--author=           --message=          --short
--branch            --no-edit           --signoff
--cleanup=          --no-post-rewrite   --squash=
--date=             --no-verify         --status
--dry-run           --null              --template=
--edit              --only              --untracked-files
--file=             --patch             --verbose
--fixup=            --porcelain         --verify
--gpg-sign          --quiet

Besides, is there any way to allow empty commit message for a repo, e.g. 
by adding something to `.git/config`? I couldn't find any in docs.

--
Hadi