Fix patternProperties annotation

[justin-tay]

Fixes an issue with patternProperties setting null as the annotation value.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (51fd82b) 78.98% compared to head (7310587) 79.01%.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #955      +/-   ##
============================================
+ Coverage     78.98%   79.01%   +0.02%     
- Complexity     1717     1719       +2     
============================================
  Files           157      157              
  Lines          5715     5718       +3     
  Branches       1079     1080       +1     
============================================
+ Hits           4514     4518       +4     
  Misses          802      802              
+ Partials        399      398       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.