verify captcha only when captcha keys present

app/controllers/application_controller.rb

@@ -7,4 +7,9 @@ class ApplicationController < ActionController::Base
   # Prevent CSRF attacks by raising an exception.
   # For APIs, you may want to use :null_session instead.
   protect_from_forgery with: :exception
+
+  def verify_captcha?(resource)
+    return true unless recaptcha_keys?
+    verify_recaptcha(model: resource)
+  end
 end