Resolution System Field has been changed so that it can never be made requried, see if we need an upgrade task that will fix up an fieldLayoutItems that make it requried.
The change has been made to make it a non-requirable field. There may be a situation where a user, in a previous version of Jira, has set the field as required which will set the FieldLayoutItem in the db to have required=true. We need to check if this will mess things up (I think it will) and if so then create an upgrade task that will set that value to false.