Fix NRE

[kronic]

If you first call the Dispose method on the ReactiveValidationObject, and then call the Dispose ValidationHelper from ValidationRule is happening NRE

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 71.75%. Comparing base (acc39e8) to head (ca95a6f).
Report is 28 commits behind head on main.

Files	Patch %	Lines
...ation/Extensions/ValidatableViewModelExtensions.cs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #657      +/-   ##
==========================================
- Coverage   71.97%   71.75%   -0.23%     
==========================================
  Files          18       21       +3     
  Lines         703      740      +37     
  Branches      146      153       +7     
==========================================
+ Hits          506      531      +25     
- Misses        119      126       +7     
- Partials       78       83       +5     

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[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.