GitLab

* lisp/vc-git.el (vc-git-find-revision): Deal with empty results from
ls-files.  Doe not pass the object as a file name to cat-file, it
is not a file name.
(vc-git-annotate-command): Pass the file name using -- to avoid
ambiguity with the revision.
(vc-git-previous-revision): Pass a relative file name.