GRN2-125: Added a configurable reCAPTCHA on sign up (#502)

* Added a configurable reCAPTCHA on sign up

* Added missing code

app/controllers/users_controller.rb

@@ -31,8 +31,15 @@ class UsersController < ApplicationController
     @user = User.new(user_params)
     @user.provider = @user_domain
 
-    # Handle error on user creation.
-    render(:new) && return unless @user.save
+    # Add validation errors to model if they exist
+    valid_user = @user.valid?
+    valid_captcha = config.recaptcha_enabled ? verify_recaptcha(model: @user) : true
+
+    if valid_user && valid_captcha
+      @user.save
+    else
+      render(:new) && return
+    end
 
     # Sign in automatically if email verification is disabled.
     login(@user) && return unless Rails.configuration.enable_email_verification