fix: do not crash on not loaded device attributes #22

Job	Run time
docker-build / build-docker-image	3m 37s
warmup-cache / build-test	1m 8s
docs / docs	2m 30s
audit / security	1m 13s
rustfs / integration-rustfs	1m 56s
credo / credo	1m 19s
formatter / formatter	1m 9s
test / test (16)	2m 23s
test / test (17)	2m 15s
dialyzer / dialyzer	2m 1s
test / test (15)	2m 18s
test / test (13)	2m 12s
test / test (14)	2m 10s
coverage / coverage	2m 38s
sobelow / security	1m 19s
azurite / integration-azurite	2m 20s
	32m 28s

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