feat: Chainid on empty

[another-rex]

Thanks to Josie and Eve, we can now do ChainID scanning on empty layers directly.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.08%. Comparing base (905d53b) to head (38ad3f9).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1526      +/-   ##
==========================================
- Coverage   69.08%   69.08%   -0.01%     
==========================================
  Files         197      197              
  Lines       18864    18853      -11     
==========================================
- Hits        13033    13024       -9     
+ Misses       5129     5125       -4     
- Partials      702      704       +2     

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