Check for colum existance for packages_enabled default value

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

ee/app/models/ee/project.rb

@@ -83,8 +83,10 @@ module EE
         validates :mirror_user, presence: true
       end
 
+      if column_names.include? :packages_enabled
         default_value_for :packages_enabled, true
       end
+    end
 
     module ClassMethods
       def search_by_visibility(level)