collation-generation: Avoid using `para_backing_state` if runtime is ancient (#4070)
fixes https://github.com/paritytech/polkadot-sdk/issues/4067 Also add an early bail out for look ahead collator such that we don't waste time if a CollatorFn is not set. TODO: - [x] add test. - [x] Polkadot System Parachain burn-in. --------- Signed-off-by:Andrei Sandu <[email protected]>
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