Add a count of blocked users on the dashboard

app/models/admin_dashboard_data.rb

@@ -49,6 +49,7 @@ class AdminDashboardData
       reports: REPORTS.map { |type| Report.find(type).as_json },
       admins: User.admins.count,
       moderators: User.moderators.count,
+      blocked: User.blocked.count,
       top_referrers: IncomingLinksReport.find('top_referrers').as_json,
       top_traffic_sources: IncomingLinksReport.find('top_traffic_sources').as_json,
       top_referred_topics: IncomingLinksReport.find('top_referred_topics').as_json

app/models/user.rb

@@ -61,6 +61,7 @@ class User < ActiveRecord::Base
   scope :admins, ->{ where(admin: true) }
   scope :moderators, ->{ where(moderator: true) }
   scope :staff, ->{ where("moderator or admin ") }
+  scope :blocked, ->{ where(blocked: true) } # no index
 
   module NewTopicDuration
     ALWAYS = -1