FIX: Changing owner of deleted reply didn't work

app/models/post.rb

@@ -781,7 +781,7 @@ class Post < ActiveRecord::Base
   end
 
   def create_reply_relationship_with(post)
-    return if post.nil?
+    return if post.nil? || self.deleted_at.present?
     post_reply = post.post_replies.new(reply_id: id)
     if post_reply.save
       if Topic.visible_post_types.include?(self.post_type)

spec/services/post_owner_changer_spec.rb

@@ -5,8 +5,8 @@ describe PostOwnerChanger do
     let!(:editor) { Fabricate(:admin) }
     let(:topic) { Fabricate(:topic) }
     let(:user_a) { Fabricate(:user) }
-    let(:p1) { Fabricate(:post, topic_id: topic.id) }
-    let(:p2) { Fabricate(:post, topic_id: topic.id) }
+    let(:p1) { Fabricate(:post, topic_id: topic.id, post_number: 1) }
+    let(:p2) { Fabricate(:post, topic_id: topic.id, post_number: 2) }
     let(:p3) { Fabricate(:post) }
 
     it "raises an error with a parameter missing" do
@@ -75,6 +75,14 @@ describe PostOwnerChanger do
       expect(p1.reload.user).to eq(user_a)
     end
 
+    it "changes the owner when the post is deleted" do
+      p4 = Fabricate(:post, topic_id: topic.id, reply_to_post_number: p2.post_number)
+      PostDestroyer.new(editor, p4).destroy
+
+      PostOwnerChanger.new(post_ids: [p4.id], topic_id: topic.id, new_owner: user_a, acting_user: editor).change_owner!
+      expect(p4.reload.user).to eq(user_a)
+    end
+
     context "sets topic notification level for the new owner" do
       let(:p4) { Fabricate(:post, post_number: 2, topic_id: topic.id) }