Project transfer: nil label ID in Lables::FindOrCreateService
https://sentry.gitlab.net/gitlab/gitlabcom/issues/817139/
NoMethodError: undefined method `id' for nil:NilClass
labels/transfer_service.rb:71:in `find_or_create_label!'
new_label.id
gitlab/metrics/instrumentation.rb:161:in `block in find_or_create_label!'
.measure { super }
gitlab/metrics/method_call.rb:36:in `measure'
retval = yield
gitlab/metrics/instrumentation.rb:161:in `find_or_create_label!'
.measure { super }
labels/transfer_service.rb:20:in `block (2 levels) in execute'
new_label_id = find_or_create_label!(label)
...
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NoMethodError: undefined method `id' for nil:NilClass