Updates and fixes for path.py

[chrisjonesBSU]

PR Summary:

This ties up some loose ends and fixes some bugs remaining from #1261 in path.py

PR Checklist

---

• Includes appropriate unit test(s)
• Appropriate docstring(s) are added/updated
• Code is (approximately) PEP8 compliant
• Issue(s) raised/addressed?

[codecov]

Codecov Report

❌ Patch coverage is 41.37931% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.36%. Comparing base (6183632) to head (6b6dae0).
⚠️ Report is 10 commits behind head on develop.

Files with missing lines	Patch %	Lines
mbuild/path/path.py	36.00%	16 Missing ⚠️
mbuild/utils/density.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1284      +/-   ##
===========================================
- Coverage    78.45%   78.36%   -0.09%     
===========================================
  Files           59       59              
  Lines         5681     5695      +14     
===========================================
+ Hits          4457     4463       +6     
- Misses        1224     1232       +8     

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