Make all CheckboxItem and RadioItem properties required

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	✔️

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (e51c869) to head (cddde14).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #267   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       827       827           
===========================================
  Files             89        89           
  Lines           2225      2225           
===========================================
  Hits            2225      2225           

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