FIX: Do not send email when user of the post has been deleted. (#4228)

app/jobs/regular/user_email.rb

@@ -175,10 +175,11 @@ module Jobs
     # If this email has a related post, don't send an email if it's been deleted or seen recently.
     def skip_email_for_post(post, user)
       if post
-        return I18n.t('email_log.topic_nil')      if post.topic.blank?
-        return I18n.t('email_log.post_deleted')   if post.user_deleted?
-        return I18n.t('email_log.user_suspended') if (user.suspended? && !post.user.try(:staff?))
-        return I18n.t('email_log.already_read')   if PostTiming.where(topic_id: post.topic_id, post_number: post.post_number, user_id: user.id).present?
+        return I18n.t('email_log.topic_nil')           if post.topic.blank?
+        return I18n.t('email_log.post_user_deleted')   if post.user.blank?
+        return I18n.t('email_log.post_deleted')        if post.user_deleted?
+        return I18n.t('email_log.user_suspended')      if (user.suspended? && !post.user.try(:staff?))
+        return I18n.t('email_log.already_read')        if PostTiming.where(topic_id: post.topic_id, post_number: post.post_number, user_id: user.id).present?
       else
         false
       end

config/locales/server.en.yml

@@ -2413,6 +2413,7 @@ en:
     spam_hosts: "This new user tried to create multiple posts with links to the same domain (%{domain}). See the <a href='/admin/site_settings/category/spam'>`newuser_spam_host_threshold`</a> site setting."
 
   email_log:
+    post_user_deleted: "User of the post has been deleted."
     no_user: "Can't find user with id %{user_id}"
     anonymous_user: "User is anonymous"
     suspended_not_pm: "User is suspended, not a message"

spec/jobs/user_email_spec.rb

@@ -125,6 +125,12 @@ describe Jobs::UserEmail do
         Jobs::UserEmail.new.execute(type: :private_message, user_id: user.id, post_id: post.id)
       end
 
+      it "doesn't send the email if user of the post has been deleted" do
+        Email::Sender.any_instance.expects(:send).never
+        post.update_attributes!(user_id: nil)
+        Jobs::UserEmail.new.execute(type: :user_replied, user_id: user.id, post_id: post.id)
+      end
+
       context 'user is suspended' do
         it "doesn't send email for a pm from a regular user" do
           Email::Sender.any_instance.expects(:send).never