GNU logs - #37310, boring messages

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Subject: bug#37310: 27.0.50; vc-revert: No such file or directory vc-nil
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Steps to reproduce:

1. mkdir gittest && cd gittest
2. git init
3. echo "foo" > bar.txt
4. git add bar.txt
5. git commit -m "bar.txt added"
6. echo "baz" >> bar.txt
7. emacs -Q
8. C-x v d <RET> -- to open vc-dir for gittest directory
9. C-x v u
10. yes <RET> -- to confirm revert

Debugger entered--Lisp error: (file-missing "Cannot open load file" "No =
such file or directory" "vc-nil")
  vc-find-backend-function(nil make-version-backups-p)
  vc-call-backend(nil make-version-backups-p "/Users/mad/gittest/")
  call-interactively(vc-revert nil nil)

Changing 'git' to 'hg' in the steps to reproduce above leads to the same
Same issue in Emacs 26.3.

vc-backend returns nil for repository root dir. Maybe vc-registered
should return t for root repository directory and all subdirs.
Evaluating (vc-find-root "/Users/mad/gittest" ".git") returns
"~/gittest/" but (vc-registered "/Users/mad/gittest") returns nil.

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Andrii Kolomoiets <andreyk.mad@HIDDEN>
Subject: bug#37310: Acknowledgement (27.0.50; vc-revert: No such file or
 directory vc-nil)
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References: <C475AD6B-90F6-4E84-8CC4-392CE53961ED@HIDDEN>
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Date: Thu, 05 Sep 2019 13:52:02 +0000

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