core: add None check to a device's extra_description

[gergosimonyi]

Closes #11882

---

Checklist

• Local tests pass (ak test authentik/)
• The code has been formatted (make lint-fix)

If an API change has been made

• The API schema has been updated (make gen-build)

If changes to the frontend have been made

• The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make website)

[netlify]

❌ Deploy Preview for authentik-storybook failed.

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🔨 Latest commit	418b685
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[netlify]

✅ Deploy Preview for authentik-docs canceled.

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🔨 Latest commit	418b685
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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.56%. Comparing base (1a02a9c) to head (418b685).
Report is 3 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
authentik/core/api/devices.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11904      +/-   ##
==========================================
- Coverage   92.62%   92.56%   -0.07%     
==========================================
  Files         760      760              
  Lines       37792    37793       +1     
==========================================
- Hits        35006    34984      -22     
- Misses       2786     2809      +23     

Flag	Coverage Δ
e2e	49.13% <50.00%> (-0.10%)	⬇️
integration	24.92% <0.00%> (-0.01%)	⬇️
unit	90.14% <50.00%> (+<0.01%)	⬆️

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[github-actions]

authentik PR Installation instructions

Instructions for docker-compose

Add the following block to your .env file:

AUTHENTIK_IMAGE=ghcr.io/goauthentik/dev-server
AUTHENTIK_TAG=gh-418b68556524372aa00438608b626a828c009a88
AUTHENTIK_OUTPOSTS__CONTAINER_IMAGE_BASE=ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s

For arm64, use these values:

AUTHENTIK_IMAGE=ghcr.io/goauthentik/dev-server
AUTHENTIK_TAG=gh-418b68556524372aa00438608b626a828c009a88-arm64
AUTHENTIK_OUTPOSTS__CONTAINER_IMAGE_BASE=ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s

Afterwards, run the upgrade commands from the latest release notes.

Instructions for Kubernetes

Add the following block to your values.yml file:

authentik:
    outposts:
        container_image_base: ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s
global:
    image:
        repository: ghcr.io/goauthentik/dev-server
        tag: gh-418b68556524372aa00438608b626a828c009a88

For arm64, use these values:

authentik:
    outposts:
        container_image_base: ghcr.io/goauthentik/dev-%(type)s:gh-%(build_hash)s
global:
    image:
        repository: ghcr.io/goauthentik/dev-server
        tag: gh-418b68556524372aa00438608b626a828c009a88-arm64

Afterwards, run the upgrade commands from the latest release notes.

[BeryJu]

/cherry-pick version-2024.10