Re: [PATCH] test-lib-functions: suppress a 'git rev-parse' error in 'test_commit_bulk'

> When 'test_commit_bulk' is invoked in an empty test repository, it
> prints a "fatal: Needed a single revision" error, but still does what
> it's supposed to do.  A test helper function displaying a fatal error
> and still succeeding is always suspect to be buggy, but luckily that's
> not the case here: that error comes from a 'git rev-parse --verify
> HEAD' command invoked in a condition, which doesn't have anything to
> verify in an empty repository.
> 
> Use the '--quiet' option to suppress that error message.