Exclude entries in 'deleted_node' table having 'os_rel_path' = NULL due to...

Exclude entries in 'deleted_node' table having 'os_rel_path' = NULL due to deletion of a copied node (see DbConnector and FileCleaner classes).

Signed-off-by: Cristiano Urban <cristiano.urban@inaf.it>

transfer_service/db_connector.py

@@ -276,7 +276,8 @@ class DbConnector(object):
                 SELECT base_path as os_base_path, '/' || fs_path AS os_rel_path, deleted_on, d.node_id
                 FROM deleted_node d
                 JOIN location l ON d.location_id = l.location_id
-                JOIN storage s ON s.storage_id = l.storage_src_id;
+                JOIN storage s ON s.storage_id = l.storage_src_id
+                WHERE fs_path is NOT NULL;
                 """)
             result = cursor.fetchall()
             cursor.close()