do not alert on deleted posts

app/jobs/regular/post_alert.rb

@@ -2,9 +2,11 @@ module Jobs
   class PostAlert < Jobs::Base
 
     def execute(args)
-      post = Post.find(args[:post_id])
+      # maybe it was removed by the time we are making the post
+      if post = Post.find_by(id: args[:post_id])
         PostAlerter.post_created(post)
       end
+    end
 
   end
 end