Handle new errors returned from catalog repository listing

Signed-off-by: Edgar Lee <edgar.lee@docker.com>

registry/handlers/catalog.go

@@ -6,9 +6,12 @@ import (
 	"io"
 	"net/http"
 	"net/url"
+	"reflect"
 	"strconv"
 
 	"github.com/docker/distribution/registry/api/errcode"
+	"github.com/docker/distribution/registry/storage"
+	"github.com/docker/distribution/registry/storage/driver"
 	"github.com/gorilla/handlers"
 )
 
@@ -45,9 +48,10 @@ func (ch *catalogHandler) GetCatalog(w http.ResponseWriter, r *http.Request) {
 	repos := make([]string, maxEntries)
 
 	filled, err := ch.App.registry.Repositories(ch.Context, repos, lastEntry)
-	if err == io.EOF {
+
+	if err == io.EOF || reflect.TypeOf(err) == reflect.TypeOf(driver.PathNotFoundError{}) {
 		moreEntries = false
-	} else if err != nil {
+	} else if err != nil && err != storage.ErrFinishedWalk {
 		ch.Errors = append(ch.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
 		return
 	}