Schedule:Review-cleanup is failing

Review cleanup job is failing which is causing increased load on cluster.

Job #328746141 failed for f2a3ec28:

scripts/review_apps/automated_cleanup.rb:65:in `block in perform_gitlab_environment_cleanup!': undefined method `name' for nil:NilClass (NoMethodError)
	from /usr/local/bundle/gems/gitlab-4.12.0/lib/gitlab/paginated_response.rb:50:in `block (2 levels) in auto_paginate'
	from /usr/local/bundle/gems/gitlab-4.12.0/lib/gitlab/paginated_response.rb:22:in `each'
	from /usr/local/bundle/gems/gitlab-4.12.0/lib/gitlab/paginated_response.rb:22:in `method_missing'
	from /usr/local/bundle/gems/gitlab-4.12.0/lib/gitlab/paginated_response.rb:49:in `block in auto_paginate'
	from /usr/local/bundle/gems/gitlab-4.12.0/lib/gitlab/paginated_response.rb:41:in `each_page'
	from /usr/local/bundle/gems/gitlab-4.12.0/lib/gitlab/paginated_response.rb:47:in `auto_paginate'
	from scripts/review_apps/automated_cleanup.rb:62:in `perform_gitlab_environment_cleanup!'
	from scripts/review_apps/automated_cleanup.rb:153:in `block in <main>'
	from scripts/review_apps/automated_cleanup.rb:146:in `timed'
	from scripts/review_apps/automated_cleanup.rb:152:in `<main>'