Merge pull request 'fix download bug' (#19) from bug-fix into develop

Reviewed-by: berry <senluowanxiangt@gmail.com>

models/dataset_permission.go

@@ -19,6 +19,7 @@ func GetUserDataSetPermission(dataSet *Dataset, user *User) (isPermit bool, err
 		if !user.IsAdmin && user.ID != dataSet.UserID {
 			log.Error("the user is not admin nor the owner of the data_set")
 		}
+		isPermit = true
 	case DatasetStatusPublic:
 		isPermit = true
 	default: