fix(speckleifc): Geometry counter not to count empty geometries

[JR-Morgan]

Geometry counter was meant to count how many geometries were used.
This is to allow us to get an idea for how many (if any) geometries were processed, but not actually used.

However, there was flaw in the null check that was leading to us counting objects that have no geometry as a "used geometry"... this meant the "used geometry" was far exceeding the "created geometry" for models that contain a lot of elements that have no geometry.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.59%. Comparing base (0cd0c3a) to head (6a79b02).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #455   +/-   ##
=======================================
  Coverage   90.59%   90.59%           
=======================================
  Files         138      138           
  Lines        6379     6379           
=======================================
  Hits         5779     5779           
  Misses        600      600           

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