fix(community.docker.docker_volume): labels can be none

[chaoslion]

Catch case where volume labels can be None (it`s the default when creating a volume).

SUMMARY

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

community.docker.docker_volume

ADDITIONAL INFORMATION

(ansi-debug-py3.11) ~/test # docker volume create foo
foo
(ansi-debug-py3.11) ~/test # docker volume inspect foo
[
    {
        "CreatedAt": "2023-11-12T08:06:39Z",
        "Driver": "local",
        "Labels": null,
        "Mountpoint": "/var/lib/docker/volumes/foo/_data",
        "Name": "foo",
        "Options": null,
        "Scope": "local"
    }
]
(ansi-debug-py3.11) ~/test # ansible localhost -mcommunity.docker.docker_volume  -a'{"volume_name":"foo","recreate":"options-changed","state":"present","label
s":{"merry":"christmas"}}'
An exception occurred during task execution. To see the full traceback, use -vvv. The error was: AttributeError: 'NoneType' object has no
 attribute 'get'
localhost | FAILED! => {
    "changed": false,
    "module_stderr": "Traceback (most recent call last):\n  File \"/root/.ansible/tmp/ansible-tmp-1699776709.2802129-75992-15114258512832
6/AnsiballZ_docker_volume.py\", line 107, in <module>\n    _ansiballz_main()\n  File \"/root/.ansible/tmp/ansible-tmp-1699776709.2802129-
75992-151142585128326/AnsiballZ_docker_volume.py\", line 99, in _ansiballz_main\n    invoke_module(zipped_mod, temp_path, ANSIBALLZ_PARAM
S)\n  File \"/root/.ansible/tmp/ansible-tmp-1699776709.2802129-75992-151142585128326/AnsiballZ_docker_volume.py\", line 47, in invoke_mod
ule\n    runpy.run_module(mod_name='ansible_collections.community.docker.plugins.modules.docker_volume', init_globals=dict(_module_fqn='a
nsible_collections.community.docker.plugins.modules.docker_volume', _modlib_path=modlib_path),\n  File \"<frozen runpy>\", line 226, in r
un_module\n  File \"<frozen runpy>\", line 98, in _run_module_code\n  File \"<frozen runpy>\", line 88, in _run_code\n  File \"/tmp/ansib
le_community.docker.docker_volume_payload_bppcq2tj/ansible_community.docker.docker_volume_payload.zip/ansible_collections/community/docke
r/plugins/modules/docker_volume.py\", line 348, in <module>\n  File \"/tmp/ansible_community.docker.docker_volume_payload_bppcq2tj/ansibl
e_community.docker.docker_volume_payload.zip/ansible_collections/community/docker/plugins/modules/docker_volume.py\", line 331, in main\n
  File \"/tmp/ansible_community.docker.docker_volume_payload_bppcq2tj/ansible_community.docker.docker_volume_payload.zip/ansible_collecti
ons/community/docker/plugins/modules/docker_volume.py\", line 168, in __init__\n  File \"/tmp/ansible_community.docker.docker_volume_payl
oad_bppcq2tj/ansible_community.docker.docker_volume_payload.zip/ansible_collections/community/docker/plugins/modules/docker_volume.py\", 
line 281, in present\n  File \"/tmp/ansible_community.docker.docker_volume_payload_bppcq2tj/ansible_community.docker.docker_volume_payloa
d.zip/ansible_collections/community/docker/plugins/modules/docker_volume.py\", line 232, in has_different_config\nAttributeError: 'NoneTy
pe' object has no attribute 'get'\n",
    "module_stdout": "",
    "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error",
    "rc": 1
}

[felixfontein]

Thanks for your contribution! Can you please add a changelog fragment? Thanks!

[chaoslion]

Updated the PR with some documentation and the missing changelog fragment.

[patchback]

Backport to stable-2: 💚 backport PR created

✅ Backport PR branch: patchback/backports/stable-2/4c220c4d7405a9f89dde0ecc5e7db6fab7209626/pr-702

Backported as #704

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[felixfontein]

@chaoslion thanks a lot for fixing this!

[chaoslion]

Sure thing :)