### Please describe the problem.

git-annex denies dropping a file because it be required, but `required` = `groupwanted` and `groupwanted` = `nothing`.

It seems that this is regardless of the value of `groupwanted`. I also tried with other expressions.

### What steps will reproduce the problem?

[[!format sh """
#!/bin/sh
set -x

# init repos & add file
mkdir local remote
cd remote
git init && git annex init remote
cd ../local
git init && git annex init local
touch file
ls
git annex add .
git remote add remote ../remote

# repo settings
git annex group remote g
git annex groupwanted g nothing
git annex required remote groupwanted

# test
git annex whereis file
git annex copy file --to=remote --auto # doesn't copy, as expected
git annex whereis file
git annex copy file --to=remote        # copies, as expected
git annex whereis file
git annex drop file --from=remote      # ERROR: drop denied
git annex whereis file

# test using required=nothing directly
git annex required remote nothing
git annex drop file --from=remote      # drops, as expected
git annex whereis file
"""]]


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


* version 7.20190819 on NixOS 19.09 as well as version 8.20200309 from unstable Nixpkgs
* local repository version: 7 (makes no difference whether 5 or 7)


### Please provide any additional information below.

[[!format sh """
# transcript
[user@host annex-test]$ mkdir local remote
[user@host annex-test]$ cd remote
[user@host remote]$ git init
Initialized empty Git repository in /home/johannes/annex-test/remote/.git/
[user@host remote]$ git annex init remote
init remote ok
(recording state in git...)
[user@host remote]$ cd ../local
[user@host local]$ git init
Initialized empty Git repository in /home/johannes/annex-test/local/.git/
[user@host local]$ git annex init local
init local ok
(recording state in git...)
[user@host local]$ touch file
[user@host local]$ ls
file
[user@host local]$ git annex add .
add file 


ok
(recording state in git...)
[user@host local]$ git remote add remote ../remote
[user@host local]$ git annex group remote g
group remote ok
(recording state in git...)
[user@host local]$ git annex groupwanted g nothing
groupwanted g ok
(recording state in git...)
[user@host local]$ git annex required remote groupwanted
required remote ok
(recording state in git...)
[user@host local]$ git annex whereis file
whereis file (1 copy) 
  	a886389d-ebd5-489c-804b-1bcbddf2c9c5 -- local [here]
ok
[user@host local]$ git annex copy file --to=remote --auto
[user@host local]$ git annex whereis file
whereis file (1 copy) 
  	a886389d-ebd5-489c-804b-1bcbddf2c9c5 -- local [here]
ok
[user@host local]$ git annex copy file --to=remote
copy file (to remote...) (checksum...) ok
(recording state in git...)
[user@host local]$ git annex whereis file
whereis file (2 copies) 
  	343d87b7-e21a-4f38-b9b6-66b01aaa7995 -- remote
   	a886389d-ebd5-489c-804b-1bcbddf2c9c5 -- local [here]
ok
[user@host local]$ git annex drop file --from=remote
drop remote file 
  That file is required content, it cannot be dropped!

  (Use --force to override this check, or adjust required content configuration.)
failed
git-annex: drop: 1 failed
[user@host local]$ git annex whereis file
whereis file (2 copies) 
  	343d87b7-e21a-4f38-b9b6-66b01aaa7995 -- remote
   	a886389d-ebd5-489c-804b-1bcbddf2c9c5 -- local [here]
ok
[user@host local]$ git annex required remote nothing
required remote ok
(recording state in git...)
[user@host local]$ git annex drop file --from=remote
drop remote file ok
(recording state in git...)
[user@host local]$ git annex whereis file
whereis file (1 copy) 
  	a886389d-ebd5-489c-804b-1bcbddf2c9c5 -- local [here]
ok
# End of transcript or log.
"""]]


### Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)

I had, some time ago I synced my phone with it. I stopped because of the painful crippled file system there, and the annex was so large that the phone was slow. But I always wanted to restart annexing, to archive and partially checkout my libraries, and maybe do the phone sync right (probably via a special remote)! It seems to be THE tool as soon as a repo is split over multiple disks.

> [[fixed|done]] --[[Joey]]
