Error on course after deleting parent site #2178

Job	Run time
Python Unittests (bionic-3.8, 3.8, tests)	23m 17s
Python Unittests (bionic-3.8, 3.8, tests_nds)	14m 37s
Python Unittests (focal-3.8, 3.8, tests)	19m 49s
Python Unittests (focal-3.8, 3.8, tests_nds)	15m 27s
Build 18.04 package	5m 22s
Build docker image	8m 44s
Build 20.04 package	5m 58s
Tests E2E 20.04	11m 12s
Tests E2E docker	9m 16s
Publish (on release only)	0s
	1h 53m 42s

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