Allow image id to fail

[fabienheureux]

Allow image download without scheme and external domain

If images have an url like //example.com/image.jpg, the imported url does not care about the domain and prepend the wagtail domain, hence leading to a 404 when downloading the image

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• Testing
  • [ ] CI passes
  • [ ] If necessary, tests are added for new or fixed behaviour
  • [ ] These changes do not reduce test coverage
• Documentation.
  • [ ] This PR adds or updates documentation
  • [ ] Documentation changes are not necessary because:

[codecov-commenter]

Codecov Report

Merging #143 (99bf46e) into main (e6f6e41) will decrease coverage by 0.04%. The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #143      +/-   ##
==========================================
- Coverage   65.05%   65.01%   -0.05%     
==========================================
  Files          32       32              
  Lines        1265     1269       +4     
  Branches      228      228              
==========================================
+ Hits          823      825       +2     
- Misses        400      402       +2     
  Partials       42       42              

Impacted Files	Coverage Δ
...l_wordpress_import/prefilters/handle_shortcodes.py	96.00% <50.00%> (-4.00%)	:arrow_down:

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[fabienheureux]

:man_facepalming:

wrong branch.