Allow calling hook for external link capture

app/forms/admin/settings/external_links_settings_form.rb

@@ -32,6 +32,8 @@ module Admin
   module Settings
     class ExternalLinksSettingsForm < ApplicationForm
       settings_form do |sf|
+        helpers.call_hook(:component_admin_settings_external_redirect, form: sf)
+
         sf.check_box(
           name: :capture_external_links,
           caption: I18n.t(:setting_capture_external_links_text)

spec/constants/settings/definition_spec.rb

@@ -1100,7 +1100,7 @@ RSpec.describe Settings::Definition, :settings_reset do
     context "when the override block returns a callable" do
       before do
         described_class.add_value_override(:bogus_override_test) do
-          -> { nil }
+          -> {}
         end
       end