Avoid waiting when only one judge can handle a submission #2002
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Before, if there are multiple judges, a submission is low priority, and only one judge is available, we don't schedule. This is a problem if only one judge can handle that submission.
We handle the case by delaying rejudges only when there are at least two judges that can handle the submission, of which only one is available.
This is currently patched into production. We'll see if it works.