prevent misleading message from being logged

pkg/minikube/image/cache.go

@@ -74,6 +74,7 @@ func SaveToDir(images []string, cacheDir string, overwrite bool) error {
 			if err := saveToTarFile(image, dst, overwrite); err != nil {
 				if err == errCacheImageDoesntExist {
 					out.WarningT("The image you are trying to add {{.imageName}} doesn't exist!", out.V{"imageName": image})
+					return nil
 				} else {
 					return errors.Wrapf(err, "caching image %q", dst)
 				}