[BUG] git-mv fails with "source directory is empty" when it should not

Hello!

In some cases git-mv fails with "source directory is empty" when this
is definitely not the case.

Example (run in an empty directory):

$ git init-db
defaulting to local storage area
$ mkdir ab; touch ab.c; touch ab/d
$ git add .
$ git commit -m 'initial'
Committing initial tree f2dd231ec22a1d4376d4a6eadf49d87dd34ac2a0
$ git mv ab a
fatal: source directory is empty, source=ab, destination=a

However, at this point the source directory is definitely not empty:

$ git ls-tree -r HEAD
100644 blob e69de29bb2d1d6434b8b29ae775ad8c2e48c5391    ab.c
100644 blob e69de29bb2d1d6434b8b29ae775ad8c2e48c5391    ab/d
$ ls -ogR
.:
total 4
drwxr-xr-x 2 4096 Dec  3 16:47 ab
-rw-r--r-- 1    0 Dec  3 16:47 ab.c

./ab:
total 0
-rw-r--r-- 1 0 Dec  3 16:47 d
$ git status     
nothing to commit

This happens both in v1.4.4.1 and in current 'master' (v1.4.4.1-g278fcd7).

-- 
Sergey Vlasov

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