Blob fixes (#3599)

* Fix error if movie back image blob was not found
* Don't error out if scene cover get fails
* Don't error out on image get fails
* Add debug logging for fs blobs
* Remove old blob data when no longer referenced

internal/api/resolver_mutation_stash_box.go

@@ -7,6 +7,7 @@ import (
 
 	"github.com/stashapp/stash/internal/manager"
 	"github.com/stashapp/stash/internal/manager/config"
+	"github.com/stashapp/stash/pkg/logger"
 	"github.com/stashapp/stash/pkg/scraper/stashbox"
 )
 
@@ -64,7 +65,7 @@ func (r *mutationResolver) SubmitStashBoxSceneDraft(ctx context.Context, input S
 
 		cover, err := qb.GetCover(ctx, id)
 		if err != nil {
-			return fmt.Errorf("getting scene cover: %w", err)
+			logger.Errorf("Error getting scene cover: %v", err)
 		}
 
 		res, err = client.SubmitSceneDraft(ctx, scene, boxes[input.StashBoxIndex].Endpoint, cover)