fix: uniqueness validator _does_ allow nil

Author: mattkhan

lib/anchor/resource.rb

@@ -78,10 +78,7 @@ def anchor_attributes_properties(included_fields:)
             description ||= column.comment if Anchor.config.use_active_record_comment
             check_presence = type.is_a?(Anchor::Types::Maybe) && Anchor.config.use_active_record_presence
             if check_presence && _model_class.validators_on(model_method).any? do |v|
-                 if v.is_a?(ActiveRecord::Validations::UniquenessValidator)
-                   opts = v.options.with_indifferent_access
-                   !(opts[:allow_nil] || opts[:allow_blank] || opts[:if] || opts[:unless] || opts[:on])
-                 elsif v.is_a?(ActiveRecord::Validations::NumericalityValidator)
+                 if v.is_a?(ActiveRecord::Validations::NumericalityValidator)
                    opts = v.options.with_indifferent_access
                    !(opts[:allow_nil] || opts[:if] || opts[:unless] || opts[:on])
                  elsif v.is_a?(ActiveRecord::Validations::PresenceValidator)