chore: stmgr: migrations: do not log noisily on cache misses

chain/stmgr/forks.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/binary"
+	"errors"
 	"os"
 	"sort"
 	"strings"
@@ -11,6 +12,7 @@ import (
 	"time"
 
 	"github.com/ipfs/go-cid"
+	"github.com/ipfs/go-datastore"
 	"golang.org/x/xerrors"
 
 	"github.com/filecoin-project/go-address"
@@ -177,11 +179,15 @@ func (sm *StateManager) HandleStateForks(ctx context.Context, root cid.Cid, heig
 	u := sm.stateMigrations[height]
 	if u != nil && u.upgrade != nil {
 		migCid, ok, err := u.migrationResultCache.Get(ctx, root)
-		if err == nil && ok {
+		if err == nil {
+			if ok {
 				log.Infow("CACHED migration", "height", height, "from", root, "to", migCid)
 				return migCid, nil
-		} else if err != nil {
+			}
+		} else if !errors.Is(err, datastore.ErrNotFound) {
 			log.Errorw("failed to lookup previous migration result", "err", err)
+		} else {
+			log.Debug("no cached migration found, migrating from scratch")
 		}
 
 		startTime := time.Now()