Cad mesh fix

[stewartboogert]

Skip empty tessellations properly
Only convert tessellations for shapes which have > 0 solids
Improve mesh statistics

[codecov]

Codecov Report

❌ Patch coverage is 74.54545% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.31%. Comparing base (eb72e5a) to head (2ba7354).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pyg4ometry/convert/oce2Geant4.py	6.66%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #271      +/-   ##
==========================================
- Coverage   74.33%   74.31%   -0.03%     
==========================================
  Files         157      157              
  Lines       22937    22953      +16     
==========================================
+ Hits        17051    17058       +7     
- Misses       5886     5895       +9     

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