[infra] Fix approve_results race condition checking failing on new builders. It would accidentally compare a null old approval map with the new approvals instead of using an empty map for the old approvals. While here, remove debug code that shouldn't have been committed. Change-Id: I071bc6fc830bbb0b0cec310a189c0ef0a46f2bb8 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/98000 Reviewed-by: Alexander Thomas <athom@google.com>
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