Resource processor error on deploying user-resource: TypeError: 'NoneType' object is not iterable

[stuartleeks]

Describe the bug
Whilst attempting to deploy a user resource (Linux VM), I encountered a failure. Inspecting the resource processor logs revealed the following error:

Exception in ASGI application
Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/anyio/streams/memory.py", line 94, in receive
return self.receive_nowait()
File "/usr/local/lib/python3.8/site-packages/anyio/streams/memory.py", line 89, in receive_nowait
raise WouldBlock
anyio.WouldBlock

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/starlette/middleware/base.py", line 41, in call_next
message = await recv_stream.receive()
File "/usr/local/lib/python3.8/site-packages/anyio/streams/memory.py", line 114, in receive
raise EndOfStream
anyio.EndOfStream

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/local/lib/python3.8/site-packages/uvicorn/protocols/http/httptools_impl.py", line 375, in run_asgi
result = await app(self.scope, self.receive, self.send)
File "/usr/local/lib/python3.8/site-packages/uvicorn/middleware/proxy_headers.py", line 75, in __call__
return await self.app(scope, receive, send)
File "/usr/local/lib/python3.8/site-packages/fastapi/applications.py", line 261, in __call__
await super().__call__(scope, receive, send)
File "/usr/local/lib/python3.8/site-packages/starlette/applications.py", line 112, in __call__
await self.middleware_stack(scope, receive, send)
File "/usr/local/lib/python3.8/site-packages/starlette/middleware/errors.py", line 181, in __call__
raise exc
File "/usr/local/lib/python3.8/site-packages/starlette/middleware/errors.py", line 159, in __call__
await self.app(scope, receive, _send)
File "/usr/local/lib/python3.8/site-packages/starlette/middleware/errors.py", line 181, in __call__
raise exc
File "/usr/local/lib/python3.8/site-packages/starlette/middleware/errors.py", line 159, in __call__
await self.app(scope, receive, _send)
File "/usr/local/lib/python3.8/site-packages/starlette/middleware/base.py", line 63, in __call__
response = await self.dispatch_func(request, call_next)
File "/api/./services/tracing.py", line 83, in dispatch
response = await call_next(request)
File "/usr/local/lib/python3.8/site-packages/starlette/middleware/base.py", line 44, in call_next
raise app_exc
File "/usr/local/lib/python3.8/site-packages/starlette/middleware/base.py", line 34, in coro
await self.app(scope, request.receive, send_stream.send)
File "/usr/local/lib/python3.8/site-packages/starlette/exceptions.py", line 82, in __call__
raise exc
File "/usr/local/lib/python3.8/site-packages/starlette/exceptions.py", line 71, in __call__
await self.app(scope, receive, sender)
File "/usr/local/lib/python3.8/site-packages/fastapi/middleware/asyncexitstack.py", line 21, in __call__
raise e
File "/usr/local/lib/python3.8/site-packages/fastapi/middleware/asyncexitstack.py", line 18, in __call__
await self.app(scope, receive, send)
File "/usr/local/lib/python3.8/site-packages/starlette/routing.py", line 656, in __call__
await route.handle(scope, receive, send)
File "/usr/local/lib/python3.8/site-packages/starlette/routing.py", line 259, in handle
await self.app(scope, receive, send)
File "/usr/local/lib/python3.8/site-packages/starlette/routing.py", line 61, in app
response = await func(request)
File "/usr/local/lib/python3.8/site-packages/fastapi/routing.py", line 227, in app
raw_response = await run_endpoint_function(
File "/usr/local/lib/python3.8/site-packages/fastapi/routing.py", line 160, in run_endpoint_function
return await dependant.call(**values)
File "/api/./api/routes/workspaces.py", line 293, in retrieve_user_resources_for_workspace_service
user_resource.azureStatus = get_azure_resource_status(user_resource.properties['azure_resource_id'])
File "/api/./services/azure_resource_status.py", line 17, in get_azure_resource_status
power_state = [x for x in vm_instance_view.statuses if x.code.startswith('PowerState')][0].display_status
TypeError: 'NoneType' object is not iterable