Fix 500 error due to None data in DAB response #10277

Job	Run time
awx-operator	12m 31s
awx_collection integration (a-h, ^[a-h])	13m 17s
awx_collection sanity (stable-2.17)	1m 36s
awx_collection integration (i-p, ^[i-p])	16m 19s
dev-env	8m 22s
awx_collection integration (r-z0-9, ^[r-z0-9])	10m 53s
api-test	18m 19s
api-migrations	14m 54s
api-lint	5m 28s
api-swagger	8m 53s
awx-collection	6m 15s
api-schema	11m 32s
combine awx_collection integration coverage	0s
	2h 8m 19s

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