Fixed crash related to issue tries to mount to not existing parent #11343

Job	Run time
search_cache / search_cache	5s
build	20m 58s
unit_testing	23m 24s
rest_api_testing	24m 50s
e2e_testing (actions_tasks)	22m 33s
e2e_testing (actions_tasks2)	33m 26s
e2e_testing (actions_tasks3)	29m 13s
e2e_testing (actions_objects)	14m 52s
e2e_testing (actions_objects2)	21m 11s
e2e_testing (actions_users)	11m 31s
e2e_testing (actions_projects_models)	16m 22s
e2e_testing (canvas3d_functionality)	20m 25s
e2e_testing (canvas3d_functionality_2)	16m 13s
e2e_testing (issues_prs)	18m 59s
e2e_testing (issues_prs2)	20m 45s
e2e_testing (features)	13m 59s
codecov	10s
generate_github_pages	5m 12s
publish_dev_images	0s
	5h 14m 8s

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