500 error on issue page

Visiting this page https://gitlab.com/gitlab-org/gitlab-ce/issues/2772 gives me 500 error.

mentioned in issue #30864 (closed)

Sentry issue: https://sentry.gitlap.com/gitlab/gitlabcom/issues/26982/

NoMethodError: undefined method `content' for nil:NilClass
Did you mean?  concern
  from lib/banzai/filter/issuable_state_filter.rb:17:in `block in call'
  from lib/banzai/filter/issuable_state_filter.rb:15:in `each'
  from lib/banzai/filter/issuable_state_filter.rb:15:in `call'

in

issuables.each do |node, issuable|
  if VISIBLE_STATES.include?(issuable.state)
    node.children.last.content += " [#{issuable.state}]"
  end
end

/cc @smcgivern

I think this has the same root cause as https://gitlab.com/gitlab-org/gitlab-ce/issues/30874, which is fixed by https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10683 in RC3.

@adamniedzielski please reopen if that's wrong 🙂

closed

added ~874211 ~12980 markdown regression labels

changed milestone to %9.1