Add nullable property #1632

Job	Run time
get_available_profiles	6s
close_client_pr	0s
update_client_pr (android-uploader, api.video-android-uploader)	2m 52s
merge_client_pr	0s
update_client_pr (android, api.video-android-client)	9m 29s
update_client_pr (csharp, api.video-csharp-client)	2m 4s
update_client_pr (go, api.video-go-client)	2m 38s
update_client_pr (java, api.video-java-client)	3m 37s
update_client_pr (nodejs, api.video-nodejs-client)	54s
update_client_pr (php, api.video-php-client)	38s
update_client_pr (python, api.video-python-client)	3m 11s
update_client_pr (swift5-uploader, api.video-swift-uploader)	3m 23s
update_client_pr (swift5, api.video-swift-client)	2m 35s
generate_documentation	10s
	31m 37s

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