Publish nightly nupkg / chore: Enable nullable annotation for validators (#2902) * chore: enable nullable for validators * chore: fix code based on review comment * chore: fix code based on review comment

Publish nightly nupkg / chore: Enable nullable annotation for validators (#2902) * chore: enable nullable for validators * chore: fix code based on review comment * chore: fix code based on review comment #351