Merge branch 'jk/maint-commit-amend-only-no-paths' into maint

"git commit --amend --only --" was meant to allow "Clever" people to rewrite the commit message without making any change even when they have already changes for the next commit added to their index, but it never worked as advertised since it was introduced in 1.3.0 era. * jk/maint-commit-amend-only-no-paths: commit: fix "--amend --only" with no pathspec