[Azure] Invalid state string when querying the instance status

[Michaelvll]

A user reported an issue when running sky serve with spot replicas, where they got an empty string from the azure cli.

E 02-08 21:57:24 replica_managers.py:1000]   File "/home/azureuser/miniconda3/lib/python3.10/site-packages/sky/backends/backend_utils.py", line 1765, in _update_cluster_status_no_lock
E 02-08 21:57:24 replica_managers.py:1000]     node_statuses = _query_cluster_status_via_cloud_api(handle)
E 02-08 21:57:24 replica_managers.py:1000]   File "/home/azureuser/miniconda3/lib/python3.10/site-packages/sky/backends/backend_utils.py", line 1630, in _query_cluster_status_via_cloud_api
E 02-08 21:57:24 replica_managers.py:1000]     node_statuses = cloud.query_status(
E 02-08 21:57:24 replica_managers.py:1000]   File "/home/azureuser/miniconda3/lib/python3.10/site-packages/sky/clouds/azure.py", line 655, in query_status
E 02-08 21:57:24 replica_managers.py:1000]     node_status = status_map[s]
E 02-08 21:57:24 replica_managers.py:1000] KeyError: ''