This is typically called by the Relay Chain to signal the migration has finished.
The data parameter might be None if we are running the migration for a second time
for some pallets and have already performed the checking account balance correction,
so we do not need to do it this time.
Finish the migration.
This is typically called by the Relay Chain to signal the migration has finished.
The
dataparameter might beNoneif we are running the migration for a second time for some pallets and have already performed the checking account balance correction, so we do not need to do it this time.