Preload issue authors when displayed on the issue list (#16091).

git-svn-id: http://svn.redmine.org/redmine/trunk@12911 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/issue_query.rb

@@ -334,6 +334,9 @@ class IssueQuery < Query
       offset(options[:offset])
 
     scope = scope.preload(:custom_values)
+    if has_column?(:author)
+      scope = scope.preload(:author)
+    end
 
     issues = scope.all