remove blank cmdids from migration

db/migrations/000020_linecmd.up.sql

@@ -35,7 +35,9 @@ CREATE TABLE cmd_migrate20 (
 
 INSERT INTO cmd_migrate20
 SELECT screenid, lineid, cmdid
-FROM line;
+FROM line
+WHERE cmdid <> ''
+;
 
 INSERT INTO cmd_new
 SELECT

pkg/sstore/sstore_migrate.go

@@ -37,7 +37,6 @@ func RunMigration20() error {
 	var migrations []cmdMigration20Type
 	txErr := WithTx(ctx, func(tx *TxWrap) error {
 		m := tx.SelectMaps(`SELECT * FROM cmd_migrate20`)
-		fmt.Printf("got maps: %#v\n", m)
 		tx.Select(&migrations, `SELECT * FROM cmd_migrate20`)
 		return nil
 	})