"Error: Package in packages.json file does not contain a description field" on Manjaro Linux
Hello, I have just installed Nim and Nimble on a new Manjaro Linux machine using the binaries provided by the distribution (`pacman -Syu nim nimble`):

```
$ lsb_release -a
LSB Version:	n/a
Distributor ID:	ManjaroLinux
Description:	Manjaro Linux
Release:	21.1.4
Codename:	Pahvo
$ nim --version
Nim Compiler Version 1.4.8 [Linux: amd64]
Compiled at 2021-06-07
Copyright (c) 2006-2021 by Andreas Rumpf

active boot switches: -d:release -d:nativeStackTrace
$ nimble --version
nimble v0.13.1 compiled at 2021-04-26 22:06:28
git hash: couldn't determine git hash
```

Running `nimble refresh` works fine, but then I cannot run `numble list` nor `nimble search`:

```
$ rm -rf .nimble
$ rm -rf .config/nimble
$ nimble refresh
Downloading Official package list
    Success Package list downloaded.
$ nimble list
     Error: Package in packages.json file does not contain a description field.
$ nimble search foo
     Error: Package in packages.json file does not contain a description field.
$ ls .nimble
packages_official.json	packages_temp.json  pkgs
$ ls .config/nimble
ls: cannot access '.config/nimble': No such file or directory
```

Yet I can see that `nim refresh` properly created the folder `$HOME/.nimble` and populated it with some files.

The only reference to this error message is in an [existing issue](https://github.com/nim-lang/nimble/issues/123) that dates back to 2015, but it was closed as solved. May you please suggest me some more test to inspect what is causing the problem?