src: connection: Fix panic when DNS lookup fails #411

Job	Run time
linting	1m 46s
internal-tests (ardupilotmega)	1m 8s
mavlink-dump	53s
internal-tests (asluav)	1m 22s
formatting	6s
internal-tests (matrixpilot)	1m 24s
msrv	1m 44s
internal-tests (minimal)	1m 8s
internal-tests (paparazzi)	1m 27s
internal-tests (python_array_test)	1m 14s
internal-tests (slugs)	1m 4s
internal-tests (standard)	1m 15s
internal-tests (test)	1m 1s
internal-tests (ualberta)	1m 13s
internal-tests (uavionix)	1m 1s
internal-tests (icarous)	2m 48s
internal-tests (common)	1m 6s
docs	29s
build	0s
test-embedded-size	0s
	22m 9s

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