NoMethodError: undefined method `authorized_groups' for nil:NilClass
https://sentry.gitlab.net/gitlab/gitlabcom/issues/797540/
NoMethodError: undefined method `authorized_groups' for nil:NilClass
users/participable_service.rb:32:in `groups'
.of_groups(current_user.authorized_groups)
projects/participants_service.rb:10:in `execute'
participants = noteable_owner + participants_in_noteable + all_members + groups + project_members
gitlab/metrics/instrumentation.rb:161:in `block in execute'
.measure { super }
gitlab/metrics/method_call.rb:36:in `measure'
retval = yield
gitlab/metrics/instrumentation.rb:161:in `execute'
.measure { super }
...
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NoMethodError: undefined method `authorized_groups' for nil:NilClass