I recently hit a case where an extension that adds a bunch of actions was hitting errors during devserver initialization and reloads. The issue seems to be that it was never fully initialized, then the devserver reloaded, and hitting an error during the extension shutdown was leaving old action registrations around, which would then fail due to duplicates. This seems like it's probably a devserver-specific problem, but it's annoying. This change catches any ItemLookupErrors that get triggered during ActionHook shutdown. Testing Done: Was able to use my extension.