fix: Allow runtime registered content scripts to not have matches

[aklinker1]

This fixes #1220 (comment)

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commit: 1499304

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.23%. Comparing base (88ff40e) to head (1499304).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1306      +/-   ##
==========================================
- Coverage   81.30%   81.23%   -0.08%     
==========================================
  Files         128      128              
  Lines        6281     6284       +3     
  Branches     1065     1068       +3     
==========================================
- Hits         5107     5105       -2     
- Misses       1159     1164       +5     
  Partials       15       15              

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[aklinker1]

Released: https://github.com/wxt-dev/wxt/releases/tag/wxt-v0.19.23