Skip processing of properties keyword if not an object

[justin-tay]

Closes #1216

Skips processing of the properties keyword if not an object, otherwise it will generate annotations it is not supposed to, which requires memory.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.00%. Comparing base (48ca3c2) to head (ef7f5fd).
⚠️ Report is 112 commits behind head on master.
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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1217      +/-   ##
============================================
- Coverage     78.90%   78.00%   -0.91%     
+ Complexity     1965     1930      -35     
============================================
  Files           172      201      +29     
  Lines          6352     6774     +422     
  Branches       1255     1191      -64     
============================================
+ Hits           5012     5284     +272     
- Misses          867     1049     +182     
+ Partials        473      441      -32     

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