Stat will pop-up the Post Migration step for dms at the end of the migration regardless if the file script exists or not.
That is the way it's works now. You can certainly submit it as an Enhancement Request.
To log an enhancement request, please visit the Stat Community Idea portal at
This area of the Stat community is dedicated to tracking customer enhancement requests and allowing the community to discuss user cases and vote on the most useful features for consideration in future releases.