hide "scores in email" notification setting if disabled by root account

fixes CNVS-21773

- enable 'Students can opt-in to receiving scores in email
 notifications' account level setting
- wait for caching (a minute or two)
- view notification preferences
- ensure the 'Include scores when alerting about grade changes'
 check box is visible
- disable the 'Students can' account level setting
- wait for cache
- view notification preferences
- ensure the 'Include scores' check box is not shown

Change-Id: I42ae9b79d736a04fe7382f33847aa70793db7f5c
Reviewed-on: https://gerrit.instructure.com/63811
Reviewed-by: Matthew Wheeler <mwheeler@instructure.com>
Tested-by: Jenkins
QA-Review: Adrian Russell <arussell@instructure.com>
Product-Review: Peyton Craighill <pcraighill@instructure.com>

app/controllers/profile_controller.rb

@@ -230,7 +230,7 @@ class ProfileController < ApplicationController
         json[:category]             = category.category.underscore.gsub(/\s/, '_')
         json[:display_name]         = category.category_display_name
         json[:category_description] = category.category_description
-        json[:option]               = category.related_user_setting(@user)
+        json[:option]               = category.related_user_setting(@user, @domain_root_account)
       end
     end
 

app/models/notification.rb

@@ -176,16 +176,15 @@ class Notification < ActiveRecord::Base
   end
 
   # Return a hash with information for a related user option if one exists.
-  def related_user_setting(user)
-    case self.category
-      when 'Grading'
-        setting = {:name => :send_scores_in_emails, :value => user.preferences[:send_scores_in_emails],
-                   :label => t(:grading_notify_include_grade, 'Include scores when alerting about grade changes.')}
-      else
-        nil
+  def related_user_setting(user, root_account)
+    if self.category == 'Grading' && root_account.settings[:allow_sending_scores_in_emails] != false
+      {
+        name: :send_scores_in_emails,
+        value: user.preferences[:send_scores_in_emails],
+        label: t('Include scores when alerting about grade changes.'),
+        id: "cat_#{self.id}_option",
+      }
     end
-    setting[:id] = "cat_#{self.id}_option" if setting
-    setting
   end
 
   def default_frequency(_user = nil)