Fix 0-dim broadcasting bug

[mtfishman]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 81.25000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.30%. Comparing base (8cfd7f9) to head (8a2554d).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/BlockArraysExtensions/BlockArraysExtensions.jl	80.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #174      +/-   ##
==========================================
- Coverage   72.94%   72.30%   -0.65%     
==========================================
  Files          37       37              
  Lines        2011     2029      +18     
==========================================
  Hits         1467     1467              
- Misses        544      562      +18     

Flag	Coverage Δ
docs	7.40% <0.00%> (-0.07%)	⬇️

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