Fix a couple of issues

[jaredpar]

This fixes the following issue:

• Fixes a few issues #129 missed a case where None was special cased in CompilationData. That meant it double added SyntaxTree items.
• Potential source of non-determinism as we're iterating a dictionary without sorting keys first.

closes #139
closes #140

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.82%. Comparing base (c310985) to head (7c22c7d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #141      +/-   ##
==========================================
- Coverage   96.84%   96.82%   -0.03%     
==========================================
  Files          43       43              
  Lines        4221     4216       -5     
  Branches      425      424       -1     
==========================================
- Hits         4088     4082       -6     
  Misses         73       73              
- Partials       60       61       +1     

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