Address @nilsding's review comments

app/controllers/user/registrations_controller.rb

@@ -1,6 +1,6 @@
 class User::RegistrationsController < Devise::RegistrationsController
   def create
-    if !APP_CONFIG.dig(:hcaptcha, :enabled) || verify_hcaptcha(model: resource)
+    if captcha_valid?
       super
     else
       respond_with_navigational(resource){ redirect_to new_user_registration_path }
@@ -14,4 +14,13 @@ class User::RegistrationsController < Devise::RegistrationsController
     yield resource if block_given?
     respond_with_navigational(resource){ redirect_to after_sign_out_path_for(resource_name) }
   end
+
+  private
+
+  def captcha_valid?
+    # If the captcha isn't enabled, treat it as being correct
+    return true unless APP_CONFIG.dig(:hcaptcha, :enabled)
+
+    verify_hcaptcha
+  end
 end

app/views/devise/shared/_error_messages.haml

@@ -1,9 +0,0 @@
-- if resource.errors.any?
-  #error-explanation
-    %h2
-      = I18n.t('errors.messages.not_saved',
-               count: resource.errors.count,
-               resource: resource.class.model_name.human.downcase)
-    %ul
-      - resource.errors.full_messages.each do |message|
-        %li= message

config/initializers/hcaptcha.rb

@@ -1,6 +1,6 @@
-if APP_CONFIG.dig(:hcaptcha, :enabled)
-  Hcaptcha.configure do |config|
-    config.site_key = APP_CONFIG.dig(:hcaptcha, :site_key)
-    config.secret_key = APP_CONFIG.dig(:hcaptcha, :secret_key)
-  end
+return unless APP_CONFIG.dig(:hcaptcha, :enabled)
+
+Hcaptcha.configure do |config|
+  config.site_key = APP_CONFIG.dig(:hcaptcha, :site_key)
+  config.secret_key = APP_CONFIG.dig(:hcaptcha, :secret_key)
 end

spec/controllers/user/registrations_controller_spec.rb

@@ -0,0 +1,15 @@
+require 'rspec'
+
+describe User::RegistrationsController do
+  before do
+    # Do nothing
+  end
+
+  after do
+    # Do nothing
+  end
+
+  describe "#create" do
+
+  end
+end