Fix 500 error due to None data in DAB response #10250

Job	Run time
awx-operator	13m 37s
awx_collection integration (a-h, ^[a-h])	9m 23s
awx_collection sanity (stable-2.17)	1m 40s
awx_collection integration (i-p, ^[i-p])	11m 36s
awx_collection integration (r-z0-9, ^[r-z0-9])	10m 17s
dev-env	4m 52s
api-test	14m 41s
api-migrations	11m 23s
api-lint	1m 36s
api-swagger	5m 38s
awx-collection	2m 43s
api-schema	7m 49s
combine awx_collection integration coverage	52s
	1h 36m 7s

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