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Problem:
deploy.py expects objects returned by checks.load() to have
before and after attributes, but the OverrideCheck class doesn't
have those attributes. OverrideCheck is not a subtype of
checks.Check, so bitrot has creeped in.
Instead of creating an OverrideCheck object when a blank check
definition is seen, just drop the definition and move on. This
achieves the goals of T149668 without bugs.