Use defined? check since @view_paths may be uninitialized

actionpack/lib/action_controller/base.rb

@@ -434,7 +434,11 @@ def hide_action(*names)
       # render("test/template") will be looked up in the view load paths array and the closest match will be
       # returned.
       def view_paths
-        @view_paths || superclass.view_paths
+        if defined? @view_paths
+          @view_paths
+        else
+          superclass.view_paths
+        end
       end
 
       def view_paths=(value)