src: connection: Fix panic when DNS lookup fails #410

Job	Run time
formatting	5s
mavlink-dump	55s
linting	1m 50s
internal-tests (ardupilotmega)	1m 7s
msrv	1m 40s
internal-tests (asluav)	1m 20s
internal-tests (matrixpilot)	1m 16s
internal-tests (minimal)	1m 5s
internal-tests (paparazzi)	1m 18s
internal-tests (python_array_test)	1m 21s
internal-tests (slugs)	1m 5s
internal-tests (standard)	1m 4s
internal-tests (test)	1m 6s
internal-tests (ualberta)	1m 18s
internal-tests (uavionix)	1m 9s
internal-tests (icarous)	1m 8s
internal-tests (common)	1m 1s
docs	36s
build	0s
test-embedded-size	0s
	20m 24s

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