Handle case where year is none when loading signage - #3611

[njourdane]

This PR handles the case where the year is None when loading a signage.

Description

I also added a utility function in the tests in order to allow to use a modified version of the ShapeFile used for tests.

Related Issue

#3611

Checklist

• I have followed the guidelines in our Contributing document
• My code respects the Definition of done available in the Development section of the documentationhttps://geotrek.readthedocs.io/en/latest/contribute/development.html#definition-of-done-for-new-model-fields
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes
• I added an entry in the changelog file -> where is it?
• My commits are all using prefix convention (emoji + tag name) and references associated issues
• I added a label to the PR corresponding to the perimeter of my contribution
• The title of my PR mentionned the issue associated

[marcantoinedupre]

The changelog is at docs/changelog.rst.

[cypress]

Passing run #7253 ↗︎

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Details:

Merge 3d4d622 into a4c5e4b...
Project: Geotrek-admin	Commit: b5482af58c ℹ️
Status: Passed	Duration: 06:31 💡
Started: Sep 27, 2023 5:09 PM	Ended: Sep 27, 2023 5:16 PM

_{This comment has been generated by cypress-bot as a result of this project's GitHub integration settings.}

[njourdane]

Thanks, I edited it.

[babastienne]

Thanks @roipoussiere for this contribution ! 🙏

The team will review the code to ensure everything is fine and if the pipeline succeed then it's okay for me to merge it.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (a4c5e4b) 98.32% compared to head (3d4d622) 98.32%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3746   +/-   ##
=======================================
  Coverage   98.32%   98.32%           
=======================================
  Files         291      291           
  Lines       21727    21732    +5     
=======================================
+ Hits        21362    21367    +5     
  Misses        365      365           

Files	Coverage Δ
geotrek/signage/management/commands/loadsignage.py	100.00% <100.00%> (ø)

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[marcantoinedupre]

I have started the CI with your changes.

Looks good, thanks! 👍

[njourdane]

My rebase caused the duplication the Bug fixes section the changelog, I force-pushed the fix.