message: fix(dataset): handle missing sqla uri in migration
diff: @@ -597,7 +597,7 @@ def postprocess_datasets(session: Session) -> None:
  )
  updated = True
  - if not is_physical and expression:
  + if not is_physical and drivername and expression:
  table_refrences = extract_table_references(
  expression, get_dialect_name(drivername), show_warning=False
  )
  