Cluster: don't send -ASK to MIGRATE.
For non existing keys, we don't want to send -ASK redirections to MIGRATE, since when moving slots from the migrating node to the importing node, we want just to ignore keys that are no longer there. They may be expired or deleted between the GETKEYSINSLOT call and the MIGRATE call. Otherwise this causes an error during migrations with redis-trib (or equivalent cluster management tools).
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