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fix(director): guard coordinator step id and empty directive #2373

Job	Run time
build	13s
test (4/4)	58s
static-analysis	38s
test (3/4)	53s
test (2/4)	46s
test (1/4)	40s
test (one-process pollution detector)	-1s
test (src)	5s
build-and-test	3s
prettier	4s
typecheck	2s
eslint	3s
	4m 24s