[CSL-28] In case of PBRmore use stored block if it's known
[CSL-28] In case of PBRmore use stored block if it's known

input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/pos-haskell-prototype,input-output-hk/pos-haskell-prototype