git diagnose with invalid CLI argument does not report error

[Sheik <sahibzone@xxxxxxxxx>]

Hi Maintainers,


Running git diagnose with an invalid CLI argument in a valid Git 
directory does not report error. Expected behaviour would be that it 
reports an error.

#Example shell commands which should have reported an error but 
continues to succeed

cd $ToAGitDirectory

git diagnose mod

git diagnose mode

git diagnose mode=all


Thanks

Sheik


[System Info]
git version:
git version 2.42.0
cpu: x86_64
no commit associated with this build
sizeof-long: 8
sizeof-size_t: 8
shell-path: /bin/sh
uname: Linux 6.5.0-2-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.5.6-1 
(2023-10-07) x86_64
compiler info: gnuc: 13.2
libc info: glibc: 2.37
$SHELL (typically, interactive shell): /bin/bash


[Enabled Hooks]