Merged r23847 from trunk to 5.1-stable (#42933).

git-svn-id: https://svn.redmine.org/redmine/branches/5.1-stable@23851 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/wiki_controller.rb

@@ -240,6 +240,7 @@ class WikiController < ApplicationController
     # don't load text
     @versions = @page.content.versions.
       select("id, author_id, comments, updated_on, version").
+      preload(:author).
       reorder('version DESC').
       limit(@version_pages.per_page + 1).
       offset(@version_pages.offset).