MWPW-144683 Allow Article Header Without Category

[meganthecoder]

• Stop creating an empty anchor tag if no category is provided in the article header

Resolves: MWPW-144683

Test URLs:

• Before: https://main--milo--adobecom.hlx.page/drafts/methomas/no-category
• After: https://methomas-article-header-cat--milo--adobecom.hlx.page/drafts/methomas/no-category?martech=off

Bacom blog:
Combined with adobecom/bacom-blog#37

• Before: https://main--bacom-blog--adobecom.hlx.page/drafts/methomas/no-category
• After: https://methomas-category-null--bacom-blog--adobecom.hlx.page/drafts/methomas/no-category?milolibs=methomas-article-header-cat

Blog (no change):

• Before: https://main--blog--adobecom.hlx.live/en/publish/2024/03/26/whats-new-at-adobe-summit-2024
• After: https://main--blog--adobecom.hlx.live/en/publish/2024/03/26/whats-new-at-adobe-summit-2024?milolibs=methomas-article-header-cat

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Commits

• cfeab80 ✅ (latest)
• 189825b ✅
• 08eace1 ✅
• 2dabaa5 ✅
• b41f201 ✅
• aa5e287 ✅

[aem-code-sync]

Page	Scores	Audits	Google
/drafts/methomas/no-category?martech=off

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.35%. Comparing base (fa5f12a) to head (cfeab80).
Report is 61 commits behind head on stage.

Additional details and impacted files

@@            Coverage Diff             @@
##            stage    #2084      +/-   ##
==========================================
- Coverage   96.36%   96.35%   -0.02%     
==========================================
  Files         166      165       -1     
  Lines       42531    43534    +1003     
==========================================
+ Hits        40986    41946     +960     
- Misses       1545     1588      +43     

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