### Please describe the problem.


### What steps will reproduce the problem?

[[!format sh """
$> git annex get 2read/ISNN2010__Tang.pdf
git-annex: Cannot mix --all or --unused with file names.
"""]]

### What version of git-annex are you using? On what operating system?


[[!format sh """
$> apt-cache policy git-annex
git-annex:
  Installed: 5.20140116
  Candidate: 5.20140116
  Version table:
 *** 5.20140116 0
        600 http://debian.lcs.mit.edu/debian/ sid/main amd64 Packages
        100 /var/lib/dpkg/status
"""]]

### Please provide any additional information below.

[[!format sh """
# If you can, paste a complete transcript of the problem occurring here.
# If the problem is with the git-annex assistant, paste in .git/annex/daemon.log

$> git annex get 2read/ISNN2010__Tang.pdf
git-annex: Cannot mix --all or --unused with file names.

but seems to start fetching some load if I do not specify any path and just run 'git annex get'.

There seems to be some screw up:

I have plenty of objects under .git/annex/objects/ (seems largely from
the directory above), nothing is now reported by unused (with obscure
msg):

$> du -scmL * 2>/dev/null | tail -1
1	total                      

$> du -scm .git/annex/objects 
334	.git/annex/objects
334	total

$> git annex dropunused all
git-annex: Map.findMin: empty map has no minimal element

Here is some portion of the history which lead to such a state (there
was git annex unused somewhere before)

25954  git annex move --unused --to onerussian.com_annex
25955  git annex dropunused
25956  git annex dropunused all
25962  git annex unused
25963  git log --stat -SSHA256E-s5639442--67691e57cb4d6c51afe838590ad265ba4bea9c291cf52d58ed24f05b70bf33bf.mp3
25965  git log --stat -SSHA256E-s143042--b4012bf03ed0a387a9e714390efa75f1dd769162cca4c9b77e516732342be3f9.html
25968  git annex move --unused --to onerussian.com_annex
25969  git annex dropunused all
25976  git annex unused
25978  git br
25980  git log --stat -Ss741707--7c215090893f1f0c994e2a9ad3088016676464bbad26768841dd08c07295a2fe.pdf.map
25981  git annex unused
25982  git annex fsck
25983  git annex unused
25984  git annex dropkey
25985  git log --stat -SSHA256E-s14534131--20de680eedb3e1fb687c9b00c154d978333b61f4ea122c632bdb5bcdbb1553ff.pdf
25986  git show de3ccae8304efbae4a7a8add49de638f64b821fc
25991  git annex fsck

# End of transcript or log.
"""]]

[[!tag moreinfo]]

> Tagged moreinfo since I have a workable theory about how this happened,
> which would make it user configuration error and not a bug, but 
> that has not been confirmed. --[[Joey]]
