NoMethodError: Repositories::LfsLocksApiController#verify - undefined method `id' for nil:NilClass

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Problem

Sentry error: https://new-sentry.gitlab.net/organizations/gitlab/issues/1299955

NoMethodError: undefined method `id' for nil:NilClass (NoMethodError)

      groups = locks.partition { |lock| lock.user_id == user.id }
                                                            ^^^
  from app/controllers/repositories/lfs_locks_api_controller.rb:61:in `block in split_by_owner'
  from active_record/relation/delegation.rb:88:in `each'
  from active_record/relation/delegation.rb:88:in `each'
  from app/controllers/repositories/lfs_locks_api_controller.rb:61:in `partition'
  from app/controllers/repositories/lfs_locks_api_controller.rb:61:in `split_by_owner'
  from app/controllers/repositories/lfs_locks_api_controller.rb:32:in `verify'

Proposal

• Try to reproduce this error
• Handle the case when the user is missing
• Add a test for this case