Cluster creation request failed exception_handler_wrapper can only concatenate str (not "NoneType") to str

Describe the bug

Creating a tkgm cluster fails before even starting to clone VMs. Creation does not launch and fails with the error below

`22-07-13 00:50:40 | mqtt_consumer:50 - process_behavior_message | Request Id: 2abaa25a-1232-40c5-a4c9-3c85c4aeb856 | DEBUG :: Received behavior invocation: urn:vcloud:behavior-interface:createCluster:cse:k8s:1.0.0 on entityId:urn:vcloud:entity:cse:nativeCluster:c8ac621e-5d61-4a47-a0e5-de2f85bc4d11 with requestId: 9c52fba2-3c8c-4472-94f8-e59b9cba89e9
22-07-13 00:50:40 | behavior_handler:45 - exception_handler_wrapper | Request Id: 2abaa25a-1232-40c5-a4c9-3c85c4aeb856 | ERROR :: can only concatenate str (not "NoneType") to str
Traceback (most recent call last):
  File "/opt/cse/python/lib/python3.7/site-packages/container_service_extension/server/behavior_handler.py", line 43, in exception_handler_wrapper
    result = func(*args, **kwargs)
  File "/opt/cse/python/lib/python3.7/site-packages/container_service_extension/server/behavior_handler.py", line 60, in create_cluster
    cloudapi_client: CloudApiClient = behavior_ctx.op_ctx.cloudapi_client
  File "/opt/cse/python/lib/python3.7/site-packages/container_service_extension/security/context/operation_context.py", line 46, in cloudapi_client
    return self.user.cloud_api_client
  File "/opt/cse/python/lib/python3.7/site-packages/container_service_extension/security/context/operation_context.py", line 59, in user
    return self.get_user_context(api_version)
  File "/opt/cse/python/lib/python3.7/site-packages/container_service_extension/security/context/operation_context.py", line 80, in get_user_context
    self._update_user_context_map(api_version=api_version)
  File "/opt/cse/python/lib/python3.7/site-packages/container_service_extension/security/context/operation_context.py", line 91, in _update_user_context_map
    api_version=api_version
  File "/opt/cse/python/lib/python3.7/site-packages/container_service_extension/common/utils/pyvcloud_utils.py", line 75, in connect_vcd_user_via_token
    is_jwt_token=True
  File "/opt/cse/python/lib/python3.7/site-packages/pyvcloud/vcd/client.py", line 1105, in rehydrate_from_token
    'Bearer ' + self._vcloud_access_token
TypeError: can only concatenate str (not "NoneType") to str
22-07-13 00:50:40 | behavior_dispatcher:81 - process_behavior_request | Request Id: 2abaa25a-1232-40c5-a4c9-3c85c4aeb856 | ERROR :: Error while executing handler: {'majorErrorCode': 400, 'minorErrorCode': <MinorErrorCode.DEFAULT_ERROR_CODE: -1>, 'message': 'can only concatenate str (not "NoneType") to str'}
Traceback (most recent call last):
  File "/opt/cse/python/lib/python3.7/site-packages/container_service_extension/server/behavior_handler.py", line 43, in exception_handler_wrapper
    result = func(*args, **kwargs)
  File "/opt/cse/python/lib/python3.7/site-packages/container_service_extension/server/behavior_handler.py", line 60, in create_cluster
    cloudapi_client: CloudApiClient = behavior_ctx.op_ctx.cloudapi_client
  File "/opt/cse/python/lib/python3.7/site-packages/container_service_extension/security/context/operation_context.py", line 46, in cloudapi_client
    return self.user.cloud_api_client
  File "/opt/cse/python/lib/python3.7/site-packages/container_service_extension/security/context/operation_context.py", line 59, in user
    return self.get_user_context(api_version)
  File "/opt/cse/python/lib/python3.7/site-packages/container_service_extension/security/context/operation_context.py", line 80, in get_user_context
    self._update_user_context_map(api_version=api_version)
  File "/opt/cse/python/lib/python3.7/site-packages/container_service_extension/security/context/operation_context.py", line 91, in _update_user_context_map
    api_version=api_version
  File "/opt/cse/python/lib/python3.7/site-packages/container_service_extension/common/utils/pyvcloud_utils.py", line 75, in connect_vcd_user_via_token
    is_jwt_token=True
  File "/opt/cse/python/lib/python3.7/site-packages/pyvcloud/vcd/client.py", line 1105, in rehydrate_from_token
    'Bearer ' + self._vcloud_access_token
TypeError: can only concatenate str (not "NoneType") to str

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/cse/python/lib/python3.7/site-packages/container_service_extension/server/behavior_dispatcher.py", line 73, in process_behavior_request
    return MAP_BEHAVIOR_ID_TO_HANDLER_METHOD[behavior_id](behavior_ctx)
  File "/opt/cse/python/lib/python3.7/site-packages/container_service_extension/server/behavior_handler.py", line 46, in exception_handler_wrapper
    raise cse_exception.BadRequestError(error_message=str(error))
container_service_extension.exception.exceptions.BadRequestError: can only concatenate str (not "NoneType") to str
22-07-13 00:50:40 | mqtt_publisher:116 - send_response | Request Id: 2abaa25a-1232-40c5-a4c9-3c85c4aeb856 | DEBUG :: publish return (rc, msg_id): (0, 8)
22-07-13 00:50:40 | mqtt_consumer:60 - process_behavior_message | Request Id: 2abaa25a-1232-40c5-a4c9-3c85c4aeb856 | DEBUG :: MQTT response: {'type': 'BEHAVIOR_RESPONSE', 'headers': {'taskId': '06e5e609-02f0-4435-afff-731284d0e5c9', 'entityId': 'urn:vcloud:entity:cse:nativeCluster:c8ac621e-5d61-4a47-a0e5-de2f85bc4d11', 'contentType': 'application/vnd.vmware.vcloud.task+json'}, 'payload': '{"status": "error", "error": {"majorErrorCode": 400, "minorErrorCode": -1, "message": "can only concatenate str (not \\"NoneType\\") to str"}}'}

Reproduction steps

1. Create a cluster from vcd wizzard
2. 
3.
...

Expected behavior

Tkgm cluster created

Additional context

CSE Server : CSE server 3.1.1 with plugin UI 3.1.0 Also try wirh CSE server 3.1.3 with plugin UI 3.3.0

VMware Cloud Director version: 10.3.1.18738571

Tkgm OVA ubuntu-2004-kube-v1.19.12+vmware.1-tkg.1-15841320193950299489.ova ubuntu-2004-kube-v1.20.8+vmware.1-tkg.1-17589475007677388652.ova ubuntu-2004-kube-v1.21.2+vmware.1-tkg.1-7832907791984498322.ova ubuntu-2004-kube-v1.22.5+vmware.1-tkg.2-f838b27ca494fee7083c0340e11ce243.ova

vmware / container-service-extension