BGPaaS: Api-server traceback when deleting VN

When deleting a VN, that has a child RI with bgp-router bgpaas-server reference (the latter is not deleted when bgpaas object is deleted), the following traceback is seen:

 Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/vnc_cfg_api_server/vnc_cfg_ifmap.py", line 1063, in _dbe_subscribe_callback
    self._dbe_delete_notification(oper_info)
  File "/usr/lib/python2.7/dist-packages/vnc_cfg_api_server/vnc_cfg_ifmap.py", line 1150, in _dbe_delete_notification
    self.dbe_uve_trace("DELETE", obj_info['type'], obj_info['uuid'], None)
  File "/usr/lib/python2.7/dist-packages/vnc_cfg_api_server/vnc_cfg_ifmap.py", line 1031, in dbe_uve_trace
    self._db_client_mgr.dbe_uve_trace(oper, typ, uuid, body)
  File "/usr/lib/python2.7/dist-packages/vnc_cfg_api_server/vnc_cfg_ifmap.py", line 1666, in dbe_uve_trace
    oo['name'] = self.uuid_to_fq_name(uuid)
  File "/usr/lib/python2.7/dist-packages/vnc_cfg_api_server/vnc_cfg_ifmap.py", line 1964, in uuid_to_fq_name
    return self._cassandra_db.uuid_to_fq_name(obj_uuid)
  File "/usr/lib/python2.7/dist-packages/cfgm_common/vnc_cassandra.py", line 841, in uuid_to_fq_name
    raise NoIdError(id)
NoIdError: Unknown id: a24ec673-6e34-4955-a1e2-ddada3b1471a