[PurgatoryPropertyAccessor] fix usage of nullsafe operator with collection accessor

[Brajk19]

Summary 📝

Checklist ✅

• Tests updated 🐛
• Changelog updated 📋

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.48%. Comparing base (fe08b34) to head (7e66d7a).
⚠️ Report is 1 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x     #140      +/-   ##
============================================
+ Coverage     97.34%   97.48%   +0.13%     
- Complexity      512      517       +5     
============================================
  Files            69       69              
  Lines          1505     1429      -76     
============================================
- Hits           1465     1393      -72     
+ Misses           40       36       -4     

Flag	Coverage Δ
8.1	97.48% <100.00%> (+0.13%)	⬆️
8.2	97.41% <100.00%> (+0.13%)	⬆️
8.3	97.20% <100.00%> (+0.12%)	⬆️
8.4	97.20% <100.00%> (+0.12%)	⬆️
8.5	97.20% <100.00%> (+0.12%)	⬆️

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