/builds/gitlab-org/quality/triage-ops/lib/missed_resource_helper.rb:29:in `move_to_current_milest...

Sentry Issue: [TRIAGE-OPS-D8](https://sentry.gitlab.net/gitlab/triage-ops/issues/3269330/?referrer=gitlab_integration)

```
/builds/gitlab-org/quality/triage-ops/lib/missed_resource_helper.rb:29:in `move_to_current_milestone': undefined method `title' for nil:NilClass (NoMethodError)
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/resource/context.rb:28:in `eval'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/resource/context.rb:23:in `instance_eval'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/resource/context.rb:23:in `eval'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/command_builders/text_content_builder.rb:63:in `eval_interpolation'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/command_builders/text_content_builder.rb:53:in `format_item'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/command_builders/base_command_builder.rb:34:in `block in content_string'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/command_builders/base_command_builder.rb:33:in `map'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/command_builders/base_command_builder.rb:33:in `content_string'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/command_builders/base_command_builder.rb:14:in `build_command'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/action/comment.rb:43:in `build_comment'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/action/comment.rb:32:in `block in act'
	from /usr/local/lib/ruby/2.7.0/delegate.rb:83:in `each'
	from /usr/local/lib/ruby/2.7.0/delegate.rb:83:in `method_missing'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/action/comment.rb:31:in `act'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/action.rb:28:in `act'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/action.rb:16:in `block in process'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/action.rb:15:in `each'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/action.rb:15:in `process'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/engine.rb:324:in `process_action'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/engine.rb:186:in `block (2 levels) in process_rules'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/engine.rb:308:in `block in resources_for_rule'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/expand_condition.rb:13:in `each'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/expand_condition.rb:13:in `perform'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/engine.rb:278:in `resources_for_rule'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/engine.rb:182:in `block in process_rules'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/engine.rb:181:in `each'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/engine.rb:181:in `process_rules'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/engine.rb:76:in `block in perform'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/engine.rb:67:in `each'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/lib/gitlab/triage/engine.rb:67:in `perform'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/bin/gitlab-triage:18:in `block in <top (required)>'
	from /usr/local/lib/ruby/2.7.0/set.rb:328:in `each_key'
	from /usr/local/lib/ruby/2.7.0/set.rb:328:in `each'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/gems/gitlab-triage-1.23.0/bin/gitlab-triage:11:in `<top (required)>'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/bin/gitlab-triage:23:in `load'
	from /builds/gitlab-org/quality/triage-ops/vendor/ruby/2.7.0/bin/gitlab-triage:23:in `<main>'
```

I believe the problem is in the `Issuable#root_id` method in `gitlab-triage`: https://gitlab.com/gitlab-org/ruby/gems/gitlab-triage/-/blob/870ca5c6964740829351ec039d08928c19621aed/lib/gitlab/triage/resource/shared/issuable.rb#L72

Story points: 2.0