Set location_id default value to null

00-init.sql

@@ -40,7 +40,7 @@ CREATE TABLE node (
     os_name                VARCHAR       default NULL,
     tstamp_wrapper_dir     VARCHAR       default NULL,
     type                   NodeType      NOT NULL,
-    location_id            SMALLINT      NOT NULL,
+    location_id            SMALLINT      default NULL,
     format                 VARCHAR       default NULL,
     -- format is used to distinguish between unstuctured (format=NULL) and structured nodes having a well defined format
     async_trans            BOOLEAN       default false,