stg-clean - Delete the empty patches in the series
stg clean
Delete the empty patches in the whole series or only those applied or
unapplied. A patch is considered empty if the two commit objects
representing its boundaries refer to the same tree object.
-a, --applied
Delete the empty applied patches.
-u, --unapplied
Delete the empty unapplied patches.
Part of the StGit suite - see linkman:stg[1]