Re: git clone of empty repositories doesn't preserve hash

> A user could prepare an empty repository and set it to use SHA256 as
> the object format.  The new repository created by "git clone" from
> such a repository however would not record that it is expecting
> objects in the same SHA256 format.  This works as expected if the
> source repository is not empty.
> 
> Just like we started copying the name of the primary branch from the
> remote repository even if it is unborn in 3d8314f8 (clone: propagate
> empty remote HEAD even with other branches, 2022-07-07), lift the
> code that records the object format out of the block executed only
> when cloning from an instantiated repository, so that it works also
> when cloning from an empty repository.