Big Importer/Scanner refactor

persistence/mediafile_repository.go

@@ -1,6 +1,7 @@
 package persistence
 
 import (
+	"errors"
 	"github.com/deluan/gosonic/domain"
 	"sort"
 )
@@ -16,6 +17,9 @@ func NewMediaFileRepository() domain.MediaFileRepository {
 }
 
 func (r *mediaFileRepository) Put(m *domain.MediaFile) error {
+	if m.Id == "" {
+		return errors.New("MediaFile Id is not set")
+	}
 	return r.saveOrUpdate(m.Id, m)
 }