Fix NewOrLoadSent erroring when no transfers were loaded

fileTransfer/store/sent.go

@@ -91,7 +91,7 @@ func NewOrLoadSent(kv *versioned.KV) (*Sent, []Part, error) {
 	}
 
 	// Return an error if all transfers failed to load
-	if errCount == len(tidList) {
+	if len(tidList) > 0 && errCount == len(tidList) {
 		return nil, nil, errors.Errorf(errLoadAllSentTransfer, len(tidList))
 	}