Remove redundant code in AtomSerializer and spec (#3528)

* Remove redundant status.reply? in AtomSerializer#object

* Cover AtomSerializer more

app/lib/atom_serializer.rb

@@ -107,7 +107,7 @@ class AtomSerializer
     serialize_status_attributes(object, status)
 
     append_element(object, 'link', nil, rel: :alternate, type: 'text/html', href: TagManager.instance.url_for(status))
-    append_element(object, 'thr:in-reply-to', nil, ref: TagManager.instance.uri_for(status.thread), href: TagManager.instance.url_for(status.thread)) if status.reply? && !status.thread.nil?
+    append_element(object, 'thr:in-reply-to', nil, ref: TagManager.instance.uri_for(status.thread), href: TagManager.instance.url_for(status.thread)) unless status.thread.nil?
     append_element(object, 'ostatus:conversation', nil, ref: conversation_uri(status.conversation)) unless status.conversation_id.nil?
 
     object

spec/fabricators/follow_request_fabricator.rb

@@ -1,4 +1,4 @@
 Fabricator(:follow_request) do
   account
-  target_account { Fabricate(:account) }
+  target_account { Fabricate(:account, locked: true) }
 end