Fix reading of unavailable DOMAIN_ENABLED setting #25

Job	Run time
lint	10s
base-images	19m 21s
app-images (nightly, pulp-minimal)	13m 28s
app-images (nightly, pulp)	28m 8s
app-images (nightly, galaxy-minimal)	8m 59s
app-images (nightly, galaxy)	10m 25s
app-images (stable, pulp-minimal)	12m 15s
app-images (stable, pulp)	25m 40s
app-images (stable, galaxy-minimal)	7m 52s
app-images (stable, galaxy)	9m 29s
	2h 15m 47s

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