`NoMethodError` for `NilClass` in `grouped_objects_for_node`
https://sentry.gitlap.com/gitlab/gitlabcom/issues/34073/
NoMethodError: undefined method `id' for nil:NilClass
lib/banzai/reference_parser/base_parser.rb:135:in `grouped_objects_for_nodes'
objects_by_id = collection_objects.index_by(&:id)
lib/gitlab/metrics/instrumentation.rb:156:in `block in grouped_objects_for_nodes'
trans.method_call_for(#{label.to_sym.inspect}).measure { super }
lib/gitlab/metrics/method_call.rb:23:in `measure'
retval = yield
lib/gitlab/metrics/instrumentation.rb:156:in `grouped_objects_for_nodes'
trans.method_call_for(#{label.to_sym.inspect}).measure { super }
lib/banzai/reference_parser/issue_parser.rb:27:in `issues_for_nodes'
@issues_for_nodes ||= grouped_objects_for_nodes(
...
(137 additional frame(s) were not displayed)
NoMethodError: undefined method `id' for nil:NilClass
Created by @grzesiek, seen on https://gitlab.com/gitlab-org/gitlab-ee/issues/2001
/cc @ClemMakesApps
Edited by Grzegorz Bizon