fix(LinkBubbleView): Don't choke on invalid URLs

[mejo-]

Fixes "TypeError: URL constructor: ... is not a valid URL."

Fixes: #6841

🏁 Checklist

• Code is properly formatted (npm run lint / npm run stylelint / composer run cs:check)
• Sign-off message is added to all commits

[mejo-]

/backport to stable32

[codecov]

Codecov Report

❌ Patch coverage is 41.66667% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.67%. Comparing base (a0fa51b) to head (24aa144).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/components/Link/LinkBubbleView.vue	41.66%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7864      +/-   ##
==========================================
+ Coverage   52.86%   59.67%   +6.80%     
==========================================
  Files         501      500       -1     
  Lines       43354    38411    -4943     
  Branches     1063     1064       +1     
==========================================
+ Hits        22918    22920       +2     
+ Misses      20329    15383    -4946     
- Partials      107      108       +1     

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[mejo-]

/backport to stable31

[kousu]

Thanks for squashing this!!