NoMethodError: undefined method `head_sha' for nil:NilClass
https://sentry.gitlab.net/gitlab/gitlabcom/issues/1637583/?referrer=gitlab_plugin
NoMethodError: undefined method `head_sha' for nil:NilClass
paginated_diff_entity.rb:14:in `block in <class:PaginatedDiffEntity>'
Gitlab::CodeNavigationPath.new(merge_request.project, diffs.diff_refs.head_sha)
grape_entity/entity.rb:496:in `instance_exec'
instance_exec(object, options, &block)
grape_entity/entity.rb:496:in `exec_with_object'
instance_exec(object, options, &block)
grape_entity/exposure/block_exposure.rb:10:in `value'
entity.exec_with_object(options, &@block)
grape_entity/exposure/base.rb:82:in `valid_value'
value(entity, options) if valid?(entity)
...
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NoMethodError: undefined method `head_sha' for nil:NilClass