improvement: make the node in relay edges non-null (#95) #777

Job	Run time
ash-ci / mix deps.get	17s
ash-ci / MIX_ENV=dev mix.compile	37s
ash-ci / MIX_ENV=test mix.compile	53s
ash-ci / mix hex.audit	30s
ash-ci / mix dialyzer	5m 30s
ash-ci / mix credo --strict	1m 3s
ash-ci / mix format --check-formatted	1m 1s
ash-ci / mix sobelow	44s
ash-ci / mix spark.cheat_sheets --check	50s
ash-ci / mix spark.formatter --check	48s
ash-ci / mix deps.unlock --check-unused	1m 10s
ash-ci / mix test	1m 12s
ash-ci / Release	0s
	14m 35s

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