TAPI get-topology-details fails to get all the nodes or the links for a given topology

Sometimes, get-topology-details rpc does not recover all the nodes and/or links of the Full Multi-layer topology as tested by the functional tests.

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FAIL: test_13_get_tapi_topology_details (test12_tapi_full_multi_layer.TransportPCEtesting)
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Traceback (most recent call last):
File "/home/christophe/git_ws/02/transportpce/tests/transportpce_tests/2.2.1/test12_tapi_full_multi_layer.py", line 238, in test_13_get_tapi_topology_details
self.assertEqual(nbLink, 13, 'There should be 13 TAPI links')
AssertionError: 12 != 13 : There should be 13 TAPI links
-------------------- >> begin captured stdout << ---------------------
{"input": {"topology-id-or-name": "T0 - Full Multi-layer topology"}}

--------------------- >> end captured stdout << ----------------------
-------------------- >> begin captured logging << --------------------
urllib3.connectionpool: DEBUG: Starting new HTTP connection (1): localhost:8183
urllib3.connectionpool: DEBUG: http://localhost:8183 "POST /restconf/operations/tapi-topology:get-topology-details HTTP/1.1" 200 None
--------------------- >> end captured logging << ---------------------

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Ran 30 tests in 624.275s